Take a peek at some facts from the It's True! books.

Dreams - forgotten one or don't understand the meaning of it? Learn how to retrieve and decipher them with 'It's True! Sleep Makes You Smarter'

Meet a weird and scary bushranger, Michael Howe, in 'It's True! Bushrangers Lost Their Heads'

Get in the driver's seat of a Formula One driver in 'It's True! Sport Stinks'

Make a Viking pizza! Recipe from 'It's True! The Vikings Got Lost'

Make your own knock-knock joke like in 'It's True! You Can Make Your Own Jokes'

See how Mount Everest messes with climbers' heads in 'It's True! Everest Kills'

Think you've seen a UFO? Then read this section from 'It's True! Hauntings Happen and Ghosts get Grumpy'

Write your own top secret note like in 'It's True! your Cat could be a Spy'

Gross and astounding ways animals protect themselves from 'It's True! Animals are Electrifying'

Find out what explorers ate - and try a few recipes from 'It's True! Burke and Wills Forgot the Frying Pan'

How to Find Your Own Fossils (from It's True! Dinosaurs Never Died)


Bushfire Survival tips (from It's True! A Bushfire Burned My Dunny Down)

Facts about Frogs (from It's True! Frogs Are Cannibals)

How Hair Can Solve a Crime (from It's True! Your Hair Grows 15 Kilometres a Year)

 


Dreams - forgotten one or don't understand the meaning of it? Learn how to retrieve and decipher them with It's True! Sleep Makes You Smarter

Don't move! To remember a dream, try to wake up slowly in the morning, without moving or opening your eyes. Now recall what you were just dreaming about. Get as much detail as you can.

- What colours, smells, objects, people, animals were there?
- What was the 'story' of the dream?
- When is the dream from: your past or present? Maybe it's something in the future?
- How did you move? Were you stuck or could you fly? Did you move normally?

- Where did the dream happen - in a place you know? Did you jump from one place to another?
- What was the 'story' of the dream?
- Most important of all, try to remember how you felt during the dream.

Now it's time to write the dream down. If you already keep a diary, you can use that (some people like to write about their days on one side of an open spread, and about their dreams on the other side). Otherwise, just use a notebook or exercise book. You might like to draw a picture of something from your dream.

When you're recalling the feelings in teh dream, also write about how you feel now, after waking up. Is it different from how you felt before you went to sleep?

Putting the pieces together

Now you're ready for the fun part. Try to link something in your dream with the real world.

- A feeling: you felt trapped an dangry like at the picnic last week.
- An object: you dreamed that your flute suddenly grew to be as tall as you
- A person or an animal: your mum grew horns and said 'moo'
- A place: a caravan park? The middle of an ocean?

Maybe you can't see any links at all: the dream was really weird! If you can't see any links, then maybe you agree with the 'Chuck Out The Junk!' crowd, or the 'Push-Ups for Your Brain' idea. Maybe your dreams just don't have meaning.

If you can see a link, then you have a clue about why your mind created this dream. From here, you can try to find more links. You could write down your link in teh middle of a piece of paper and try to connect it to something else in the dream. Look at your dream 'pictures' and try to imagine what else they could mean. Sometimes it's dun to talk about your dream with someone who knows you well.

Now you can choose your dream theory, based on what you see in your dream:

- Did your dream release a feeling or a useless memory?
- Did you do something in your dream that you really want to do in real life?
- Did the dream show you a new way of looking at a problem, or help you better understand the world?

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Meet weird and scary bushranger, Michael Howe, in 'It's True! Bushrangers Lost Their Heads'

Michael Howe had been a soldier in England but he deserted the army and then tried to hold up a coach. He was convicted of highway robbery and his punishment was transportation to Van Dieman's Land (now known as Tasmania).

He ran away and joined a gang of 30 escaped convicts led by John Whitehead. The gang was renowned for its cruelty. One man who had given the police information about the gang was tortured by being forced to wear a pair of shoes filled with bull-ants. Bitten hundreds of times by angry ants, the man died in agony. The gang stole sheep, burned farmhouses, and shot people who tried to stop them.

In October 1814 Whitehead was caught by some soldiers and shot dead. The gang needed a new leader, and Michael Howe stepped forward. After taking over the gang, Howe soon made some strange changes. The other gang members had to swear on a prayer book that they would obey him. He also kept a diary, bound in kangaroo hide, of the gang's crimes. To make it really special, he wrote it in blood.

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Get in the driver's seat of a Formula One driver - facts from 'It's True! Sport Stinks'

Driving a racing car is hard work. And it's dangerous. Since Grand Prix racing began in 1950, 75 drivers have died in races or at practice.

Racing around the track is also a pretty intense work-out. A normal resting heart rate is around 50-60 beats per minute. Formula One drivers' hearts can pound at over 180 beats per minute for long periods. Their blood pressure increases by as much as 50 per cent above resting levels. Racing car drivers also become very hot and dehydrated during a race. The cockpit of their car can reach 50 degrees Celsius! The drivers have to wear a fireproof balaclava under their helmet, a long-sleeved fireproof vest under their overalls, and gloves. Drivers can lose as much as 5 litres of sweat during a race. Imagine what they must smell like at the end! (It's true that they get paid millions of dollars, though.)

AN EARBASHING TIDBIT: The noise in the driver's seat of a Formula One racing car can reach 125 decibels. That's as loud as a chainsaw, or like standing right in front of the speakers at a rock concert!

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Make a Viking pizza! Recipe from 'It's True! The Vikings Got Lost'

We said that Vikings ate bread. They also made a kind of pizza, believe it or not. This was mostly made in Denmark and other countries further south. In the freezing north, growing wheat or barley for flour wasn't really possible.

INGREDIENTS

Base: 7 cups wheat flour, 3 cups buttermilk, 1 egg, pinch salt

Topping: chopped meat and cheese OR fruit, nuts, honey OR toasted stinging nettles (true!)* OR fish and shellfish

Mix flour, buttermilk, egg and salt, and knead. Shape into small balls and flatten on a sheet of metal.

Press topping into each one and cook in a hot oven for about 10 minutes.

Tap it and if it sounds hollow, it's ready!

*Toasted stinging nettle sounds a lot worse than it is. It's not too different from spinach or other greens on a modern pizza. Of course, if you put raw nettles on your pizza they will bite you back ...

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Make your own knock-knock jokes like in 'It's True! You Can Make Your Own Jokes'

Knock Knock

Who's there?

Venice.

Venice who?

Venice dis door going to be opened?

MAKE YOUR OWN!

1) Write a list of names on a piece of scrap paper:

  • People you know
  • Names in magazines or newspapers
  • Names from TV programs

2) Take another piece of paper. Head it up at the top like this:

LIST A
LIST B

Look at your list of names. Say each name to yourself. When you find a name that sounds like another word, write the name in List A. Write the word that the word sounds like in List B.

For example:

LIST A
LIST B
Lena
lean a
Willy
will he
Carrie
carry
Jonah
do you own a

All knock-knock jokes follow this pattern:

Knock knock

Who's there?

__________

__________ who?

(Use one of your names from List A to fill in the gaps.)

PUNCHLINE

When you get to the punchline, find a funny ending for the List B word or phrase. For example, the 'Jonah' joke might end:

'Jonah red sports car? Better run, it's rolling down the hill.'

Use the lists to make up more jokes.

(You can also use surnames, cities, countries, animals and food in List A)

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See how Mount Everest messes with climbers' heads in 'It's True! Everest Kills'

In 1933 on Mount Everest's North Ridge, British climber Frank Smythe sat for a rest, broke his mint slice in half and offered it to the companion who'd been climbing with him for hours ... Trouble was, there was no one there! He was alone, as he had been all day.

In 1978 during a solo climb, Reinhold Messner became aware of an invisible companion directing him through difficult sections. Later, he chatted away to the 'young girl' beside him who told him the weather would hold and he'd reach the summit - and he did.

In 1988, British climber Stephen Venables was forced to spend a night alone on Everest's South Summit - and he imagined that a lovely old man appeared and rubbed his feet and someone else offered him a hot bath!

In 1996, Australian Michael Groom felt he was guided by the presence of his dead mate, Lobsang Sherpa. Groom and Sherpa had summitted three years earlier, but Sherpa had fallen and died on the way down.

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Think you've seen a UFO? Then read this section from 'It's True! Hauntings Happen and Ghosts get Grumpy'

Most UFOlogists (people who study UFOs) would agree that 95 per cent of UFO sightings turn out to be natural or man-made objects. Once UFOs have been investigated and identified, they are called IFOs - Identified Flying Objects.

The things most commonly mistaken for UFOs are:

the planet Venus, stars, aircraft lights, weather balloons, kites, satellites, shooting stars, the moon, saucer-shaped clouds lit by rays from a setting sun, strange electrical effects, such as ball lightning or St Elmo's Fire ( a halo of light that appears around pointy objects suchh as ships' masts or church steeples in bad weather.)

Other strange (but true) IFOs include:

an owl that had eaten some glow-in-the dark fungi, city lights reflecting from the white stomachs of a flock of geese and a swarm of insects affected by St Elmo's Fire!

If you think you've spotted a UFO:

There are several sites on the internet where you can report your experience. You could start with:

The Australian UFO Research Network http://homepage.powerup.com.au/~auforn/Report_Form.html

Sci Fi http://www.SCIFI.com or email UFO@www.SCIFI.com

Experienced UFOlogists will review selected encounters and publish their findings at the UFOlogy Centre.

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Write a top secret note like in 'It's True! Your Cat could be a Spy'

Make your own invisible ink to write a top secret note! The simplest kind is lemon juice. You dip a toothpick or small stick in juice, write your message (in code, of course) and let it dry. To read your secret message you need to heat the paper. Use an iron to make your message visible - the letters will appear brown.


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Gross and astounding ways animals protect themselves from 'It's True! Animals are Electrifying'

In the fight for survival, all living organisms have developed ways of defending themselves and protecting their young. Sometimes the young have defences of their own. Many animals, even small ones, are ferocious fighters and have ingenious weapons.

The Incredible Fart
You have probably heard of snakes that hiss or rattle their tails to warn off predators. Well, there are two types of snake found in North America that prefer to fart at their enemies instead. Both have odd names - the Sonoran Coral Snake and the Western Hook-nosed Snake - and they are fairly small. But the farts, which polite scientists call “cloacal popping” and just mean the sound coming from the reptile’s excretion sac, are loud enough to be heard one or two metres away. The snakes can fire off a few in quick succession and they sound very like human farts. It must be a handy excuse for bushwalkers in the area who’ve eaten baked beans for breakfast.

Bums away!
There’s a small black and yellow beetle, called a Bombardier Beetle, found in most parts of the world that can shoot a scalding hot chemical spray out of its backside. It’s called a Bombardier Beetle because it can fire off 20 or 30 rounds in quick succession, popopopopopopopop! The mixture is strong enough to stun other insects and send bigger predators, like frogs, hopping away gasping for clean air.

High velocity vomit
Even more gross is the defence of the fulmar, a seabird found in the cool to cold parts of the world. These birds defend their nests by making coughing noises and lunging at intruders, such as otters and other birds like skuas, ospreys and sea eagles. They also spew out jets of foul-smelling stomach oil. It’s the only way young chicks can defend themselves when their parents are away foraging at sea for up to 20 hours at a time.

From their first moments out of the egg, hatchlings have the ability to vomit oil, and their aim is very good. At four days old they can spew nearly half a metre, while older chicks have a range of about one and a half metres. Apart from its bad smell, the stomach oil clings to the feathers or hair of a predator, makes it matted and destroys the insulating properties. The would-be attacker can become waterlogged and drown.

Slimebag
Now here’s a real slippery customer that lives in cold waters up to 10,000 metres deep. It’s a long (up to 80 centimetres) eel-like seafloor-dweller called a hagfish that has no scales, no bones and no jaws, just a gaping mouth and raspy tongue. Because it can produce bucket-loads of gooey muck when in trouble, it is also known as a slime eel. The slime is produced in glands along both sides of the creature’s body. It comes out of the fish in concentrated form and then swells up when it seeps into the water. The goop is reinforced with tiny fibres that make it strong and difficult for an attacking fish to pull off. The result is a cocoon of slime that completely covers and protects the hagfish. That makes it a real slimebag.

The slime can suffocate an attacker by clogging its gills, but the hagfish itself ‘sneezes’ out any slime that gets in its own nostrils. When danger passes, it ties itself into a knot and then pushes the knot down its body to wipe the slime away.

Squirting blood
The horned lizard, which lives in the deserts of the US and Mexico, has several ways of defending itself against predators like snakes, larger lizards and hawks. First it stays very still so that its dirt colours blend into the surroundings and make the lizard hard to see. If this doesn’t work, it tries hissing and puffing up to look bigger and more menacing, showing the spikes on its body that give the reptile its name. If that fails, it has one last chance. The lizard shoots blood out of its eyes.

How does it do this? By increasing the blood pressure in its head and sinuses (pinch your nostrils shut and then try to blow your nose to give you an idea how it works). This ruptures tiny blood vessels and the blood squirts out through the lizard’s tear ducts. It’s a gruesome sight. The lizard can fire a jet of blood and hit an attacker up to a metre away. The lizard’s blood contains irritants, so a direct hit in an attacker’s face will sting. Even if the blood doesn’t hit, the squirting eye takes the predator by surprise and gives the lizard time to escape.


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Find out what explorers ate - and try a few recipes from 'It's True! Burke and Wills Forgot the Frying Pan'

English people in the nineteenth century were possibly the worst cooks in the history of the world. A standard dish was boiled cabbage with boiled mutton (the meat of old sheep).

Out in the bush, though, there weren’t any cabbages. Most explorers set off on their travels with bags of flour (for making Damper), barrels of salt meat and boxes of tea, salt and sugar. Vitamins? Forget it. No one knew about vitamins back then.

BOILED SALTED MUTTON OR PORK
1 Soak some salted meat in water. Drain off the salt water, throw it away and soak the meat again.
2 Put it in a pan, cover with water and boil until the meat has given up. Serve.

DAMPER, EXPLORER-STYLE
1 Mix some flour with water and a little salt until you have a heavy dough.
2 Mould the dough into flat, round pieces and spread them out on strips of bark.
3 Bake in the ashes of your fire.
4 Take a really deep breath and eat it. It should taste like a wodge of partly boiled cardboard.

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How to Find Your Own Fossils
(From 'It's True! Dinosaurs Never Died' by John Long)

FINDING DINOSAUR FOSSILS ISN’T EASY, BUT HERE ARE A FEW HANDY TIPS.

Find the right rocks
Dinosaurs lived in the Mesozoic Era, so rocks 225 to 65 million years old are the ones to go for. We also know that most dinosaur fossils are found in sedimentary rocks deposited in ancient rivers or lakes.

Find a rock mapper
You might be able to get hold of a map of your area showing rock types, but the map will only be helpful if you know someone who is trained to read a geological map correctly. Geologists can often be contacted through your local natural history museum, or through geology departments at most universities. Be sure to ask for a specialist in Mesozoic sedimentary rocks!

Get the OK from the landowner
You need permission to look for fossils on their land.

Pack the correct tools
You will need hammers and chisels, and possibly a pick for digging large holes, plus wrapping paper, plaster of paris and cloth to pack your finds.

Know what to look for
Remember, fossilized bones often look nothing like modern bone. They can be black or brown in colour, and may have turned to stone, because of minerals seeping into them.

WHAT TO DO IF YOU FIND FOSSIL BONE

Take a small piece of the bone, wrap it up carefully and bring it in to your local museum. If you have found a real dinosaur bone, the museum palaeontologists will want to see the site and organise the excavation properly. They know how to dig it up without damaging any of the bones. Fossilised bones are often very brittle and easy to break.

CAN FOSSIL-HUNTING BE A JOB?

Jobs in palaeontology do not come up very often, and they are mostly in museums or universities. Micro-palaeontologists study micro-fossils and help mining companies searching for oil, gas or mineral deposits. Studying fossils also helps us to understand climate changes.

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Bushfire Survival Tips
(From 'It's True! A Bushfire Burned my Dunny Down' by Tracey McGuire)

IN A CAR
Carry woollen blankets, a torch and drinking water in your car.

IF YOU ARE IN A CAR IN A BUSHFIRE:
• Pull over to the side of the road into a clear area.
• Wind up windows and close all vents.
• Keep the engine running.
• Turn on headlights and hazard lights.
• Cover up skin with long pants, shirt, sturdy boots, broad-brimmed hat and gloves.
• Get down below window level and cover up with a woollen blanket.
• Stay down low inside your car until the fire front passes.

WHAT NOT TO DO . . .
• Don’t get out and run.
• Don’t park in long, dry grass or scrub.
• Don’t drive near bushfires or into smoke.
• Don’t wear shorts or thongs.

AROUND THE HOUSE – IF YOU LIFE IN A BUSHFIRE PRONE AREA
Prepare a box of items that will help you survive in case of fire, including:
• Long-sleeved overalls or long-sleeved shirt and trousers.
• A wide-brimmed hat or hard helmet.
• Sturdy footwear such as boots, preferably leather.
• Gloves – not rubber or synthetic.
• A mask or large handkerchief to filter the smoke.
• Goggles or glasses to protect eyes.
• A water bottle.
• A torch, a portable radio and spare batteries.
• Woollen blankets.

BEFORE BUSHFIRE SEASON
• Remove leaves, dead branches and any rubbish around the house.
• Clear leaves and twigs from roof and gutters.
• Keep grass short.
• Make a firebreak or cleared area around your home.
• Make a Bushfire Survival Plan.
• For help making a Bushfire Survival Plan visit www.cfa.vic.gov.au or get a copy of Living in the bush Bushfire Survival Plan workbook from your nearest CFA office.

IF A FIRE IS APPROACHING
• To report a fire phone 000.
• Have suitable clothes and boots ready for all family members.
• Fill sinks, baths and buckets with water and turn off gas and power.
• Close all windows and doors, and block any gaps.
• Plug downpipes with rags and fill all gutters with water. Hose down the house.
• Leave vehicles in a clear area, not in a garage.
• Don’t let animals out of paddocks . . . they are safer where they are.
• Stay alert for spot fires and extinguish them immediately.
• Avoid radiant heat until the front of the fire has passed.

There are lots more survival tips in the book …

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Facts about Frogs from 'It's True! Frogs Are Cannibals' by Michael J. Tyler

Chapter 1
of skins and skeletons
the bare, bony facts

Frogs don’t look bony. You’d think they were just gristle and skin, but they do have a skeleton. It’s not too different from any other land animal’s skeleton, with skull bones, backbones and tailbone. But some frogs have green bones, no one knows why.
We know from fossils that frogs have lived on this planet for 230 million years – since the time of the dinosaurs. (Humans have existed for only one million years.) The fossil frogs aren’t too different from the ones we have today, so it seems that the original frogs were well designed for life on Earth.
Frogs and toads belong to the group of animals we call Amphibia. This doesn’t mean they go in and out of water all the time. It means they have a double life: the first part is spent in water (as tadpoles), and the second on land. Unlike their cousins, the newts and salamanders, they are tailless amphibians.

having your skin and eating it too
Our skin rubs off in tiny pieces all the time, but snakes and large lizards slip off the whole thing all at once. This is called sloughing (sluff-ing) or ecdysis.
Frogs go one step further. They slough their skin, and then eat it!
How does sloughing work? Glands in the skin secrete mucus (slimy stuff), and this separates the dead skin from the living skin beneath it. When the time comes, the frog frantically twists its body, and puffs up and shrinks itself over and over again, to get rid of the skin. People who see their pet frogs contorting themselves like this think they are about to die! Finally the skin splits – then the frog stuffs it in its mouth and swallows it. A frog shedding and eating its skin is not a pretty sight.
It happens often, too – a well-fed captive frog will shed its skin about once a week.
Frogs’ skin is incredibly useful. It’s used for breathing and drinking. Perhaps that’s why they don’t want to lose it.

three ways of drinking . . . and two of them are rude
We think of ‘drinking’ as taking in water (or other liquids) through the mouth. Frogs never drink this way. They have three main ways of taking in water.
You’d never guess it, but insects can be up to 95 per cent water. Frogs absorb water when they digest insect prey.
This one is hard to believe. Frogs drink through their backsides! They can soak up moisture through their skin; and the area of skin that does it best is the ‘seat patch’. The skin on the frog’s backside is grainy, or bumpy, and this gives a larger surface in contact with the moisture. If a frog becomes dehydrated (dried out), it will sit with its seat patch pressed hard against a moist surface.
Some frogs have grooves running up the inside of the thigh leading to their cloaca (like our anus).
In this way, frogs take up water when they are in a moist place, and they lose it when their surroundings are dry. In and out all the time.
Frogs have big bladders, and will often squirt out the contents when you pick them up!

three ways of breathing, too
If you watch a frog at rest, you'll see that its ‘chest’ doesn’t move much, but its throat goes in and out a lot. What's going on?
The frog is breathing through its lungs (taking in a gas called oxygen, sending out another gas called carbon dioxide), just as we do. But its lungs aren't very
big or efficient.
It can take up oxygen much more readily through the roof of its mouth. That's why its throat goes in and out.
On the inside of our lungs are thousands of tiny branching tubes full of threadlike blood vessels, giving a huge surface that absorbs oxygen from air we breathe in. Frog lungs are just simple hollow sacs with a surface area of only a few square centimetres. They don’t capture much oxygen. The roof of a frog’s mouth, though, has lots of tiny blood vessels and is very good at absorbing oxygen.
There’s a third way of breathing, and it’s the most important. Most frog species rely mainly on their skin to take up oxygen. This works only when it’s wet. This is why it's so important for frogs to have somewhere damp to stay.
Shampoo, soap, wetting agents used by gardeners and chemicals used in weed-killers are all deadly to frogs. They interfere with frogs' ability to take up oxygen through their skin.
So there are three ways for a frog to breathe: through its lungs, the inside of its mouth and its skin - especially its skin.

please! where are your table manners?
Frogs are really gross eaters. They always swallow their food whole without chewing, and they use their eyeballs - yes, their eyeballs - to help move food into the throat. They love to eat insects, and they really are pigs - they'll eat and eat and eat.
Frogs do have teeth, and use them to hold their prey before swallowing. They don’t use teeth for chewing at all. You can understand why when you learn that they have teeth only in the upper jaw (plus sometimes an extra set in the roof of the mouth).
Most tadpoles have teeth too. Tadpole teeth are made of a black substance called keratin (the same stuff that makes fingernails and hair, horns and feathers), and there can be up to sixteen rows of them!

‘kekekekekekekek i love you, babe’: frog courtship
You've probably heard of crooners singing love songs - but croakers? Yes, in the world of frogs, males woo females by pretending to have laryngitis. Here's how to win the woman of your dreams in Pondland.
Force air across your larynx (voicebox) and at the same time inflate the sac beneath your throat to amplify the sound. (In some species this sac looks like a pair of floaties.) If you're unlucky you won't have a sac, and your sounds will be very soft. If you're lucky and you have a good big sac, you'll be very loud and other frogs will hear you from a kilometer away.
Each species has its own call. People who have spent a lot of time listening can recognise the different calls, just as bird-lovers can identify birds by their songs.

ear, ear!
Some frogs do have ears -not the outer fleshy thing that we call an ear
but the bit that actually registers the sound, the eardrum. This is also called
the tympanum. It's a circle of cartilage on the outside of the head just behind
the eye. Sometimes the tympanum is partly or totally covered with skin.
It doesn't matter, the frog can still hear perfectly well.
The interesting thing is that a frog's ears are designed to pick up calls from males of its own kind only. They act like a radio tuned to a particular radio station. Broadcasts from the other stations aren't 'heard' by the radio, and calls from other species are not 'heard' by a frog.
A mixed frog chorus of many species sounds like a total jumble of noise to us, but it comes across as top of the pops in Dolby stereo to each listening frog.
We know that frogs can also sense vibrations in the ground, because Australian Aborigines used to collect them by stamping. They said that frogs mistook the vibrations for thunder, and came out of hiding to enjoy the rain.

the mating urge
When frogs are ready to mate, the males migrate to ponds and call the females in. Each female chooses the male she is most attracted to, and generally returns to the same pond each year.
Mass migrations of frogs can cause problems if there are roads on the way - problems for the frogs, that is. They get squashed in their thousands.


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It's True! Your Hair Grows 15 Kilometres a Year by Diana Lawrenson

Chapter 1
Secrets in hair
A single strand of your hair can tell people about you, even if you're miles away from it, or dead. It reveals the major racial group you belong to. It can show if you’ve been poisoned or taking certain drugs. It may help prove you innocent or guilty of a crime.
Hair takes longer to rot than the fleshy parts of a body. If a body is frozen, or buried in a hot, dry place, hair can last for thousands of years. The Ice Man of the European Alps, Egyptian mummies and frozen mammoths still had hair when they were discovered.

Hair and crime
Hair holds many clues that scientists can uncover. Poisons such as arsenic, mercury and lead, and drugs such as cocaine, heroin and marijuana can stay in hair for days, or years. Forensic scientists are able to separate them through chemical tests.
At a crime scene, hair is valuable trace evidence. It's collected by forceps or a sticky tape or a filter vacuum and taken back to the laboratory. Scientists who look at it under a microscope can work out what part of the body it's from, whether it belongs to a young child or an adult, and if it is dyed. The type of dye can be determined, too.
A forensic scientist can see if a strand belongs to a person or a dog, or other animal.
If a hair from a crime scene matches another (e.g., one from a person's hairbrush), it can identify a missing person, or a victim, or a suspect in a crime.
Hair pulled out during a violent struggle can be enough to solve a crime - a crime a criminal thought he'd planned perfectly. This is because the hair that tells the most about you is a strand that's been plucked or yanked out, rather than one that's been shed naturally, or cut off.
Plucked hair has the root and some skin cells attached to it. The DNA on a microscopic piece of tissue attached to the root of one of our hairs is enough to identify and set us apart from anybody else in the world, unless we have an identical twin. It even shows if we are male or female.
Hair collects evidence, too. Fine hair brushes are dusted over fruit that’s imported into Australia. The brushes are then examined under microscopes to see if the fruit carries any mites not found in Australia that could damage our crops.

Mementoes and murder
Scientific examination of hair has helped uncover how Napoleon Bonaparte,
the Emperor of France, really died in 1821. Back then his doctors believed
his death was due to cancer of the stomach. But it wasn’t . . .
From 1815 the English held Napoleon prisoner on the island of St Helena. During these years, his valet kept a diary. When it was published 50 years ago, Swedish scientist Dr Sten Forshufvud read the descriptions of Napoleon and his many ailments. Over time Napoleon’s thirst had increased, he’d lost a lot of body hair and he became very fat – three of the many symptoms of arsenic poisoning. Had Napoleon been murdered?
The one way to find out if these suspicions were correct was to examine the Emperor’s hair.
In the days before photographs, people gave away hair as a keepsake to friends or lovers, to be woven into a ring or bangle or put in a locket. Napoleon did this, too (and people even souvenired some from his corpse!).
Around 150 years after he died, forensic scientists tested strands of his hair and were able to show they did contain a large amount of arsenic.
Who gave it to Napoleon, and why? Canadian historian Dr Ben Weider helped provide the answers.
Napoleon had many enemies, including the French royal family. One of his staff, the Count de Monthelon, was a secret royalist, and he was responsible for Napoleon’s wine on St Helena. He was able to add tiny amounts of arsenic to the wine casks – enough to make Napoleon seriously sick, but not enough to kill him.
There’s an extra twist to the story. The valet’s diaries record that a few days before the end, an unknown person (now thought to be the Count) gave Napoleon medicines for two of his arsenic-induced complaints: constipation and terrible thirst. One medicine was an overdose of calomel, and the other was a drink of orange and oil of bitter almonds. These two concoctions combine in the stomach to form mercury cyanide - a deadly poison. That is what finally killed Napoleon Bonaparte.