Humans are the only mammals that will willingly delay sleep.
Sea otters hold hands while sleeping to avoid drifting apart.
Dreams can last from a few seconds to over 30 minutes.
The record for the longest time without sleep is 11 days.
You can't sneeze while you're asleep.
12% of people dream entirely in black and white.
Dolphins sleep with one eye open.
Your brain is more active while you're asleep than when you're awake.
Snails can sleep for up to three years.
The older you get,
The less sleep you need.
Sleepwalking is more common in children than adults.
Koalas sleep up to 22 hours a day.
Lack of sleep can shrink your brain.
Cheese before bed doesn't give you nightmares.
It might actually improve sleep.
The word sleep comes from the old English sleipan.
Most dreams are forgotten within five minutes of waking up.
Sharks sleep while swimming.
The inventor of the chocolate chip cookie sold her recipe for a lifetime supply of chocolate.
A single bat can eat up to 1,
000 mosquitoes in one hour.
Snails have four noses.
Male penguins propose to females with rocks.
The moon is moving away from Earth by 1.
5 inches per year.
Octopuses have copper-based blood,
Which is blue.
The first hot air balloon passengers were a sheep,
A duck,
And a rooster.
A lion's roar can be heard up to five miles away.
Human teeth are just as strong as shark teeth.
A starfish doesn't have a central brain.
Kangaroos can't hop backward.
Sloths are so slow that algae can grow on their fur.
Octopus ink is a mix of mucus and melanin.
Goldfish can distinguish between classical music and jazz.
A cat's purring can heal its bones.
All clownfish are born male.
Male platypuses are venomous.
The Great Wall of China isn't visible from space.
Sharks don't have vocal cords and can't make sounds.
A kangaroo can't hop if its tail is lifted off the ground.
The word salary comes from salt,
As Roman soldiers were paid in it.
An eagle can kill a young deer and fly away with it.
A group of squirrels is called a scurry.
The inventor of the ice cream cone was originally a waffle maker.
Grasshoppers existed before dinosaurs.
Alligators can live up to 100 years.
A starfish has no brain and no blood.
Jellyfish can clone themselves.
Mice sing to each other,
But it's at frequencies humans can't hear.
Blue eyes are more sensitive to light than brown eyes.
Coconuts kill more people each year than sharks do.
A crocodile can't stick out its tongue.
Ducks' quacks don't echo,
And nobody knows why.
Polar bears can't hear.
Polar bears can overheat,
Despite living in the Arctic.
The inventor of the roller coaster wanted to distract people from sinning.
Snails can have up to 14,
000 teeth.
Rats can laugh when they're tickled.
A human sneeze can travel at 100 miles per hour.
Bananas grow upside down.
The inventor of the escalator called it a moving staircase.
A group of crows is called a murder.
Camels' humps don't store water,
They store fat.
Spiders can tune their webs like guitar strings.
The word nerd was first used in a Dr.
Seuss book.
Elephants are the only animals that can't jump.
A hummingbird's heart beats over 1,
200 times per minute.
A group of jellyfish can't swim.
A fish is also called a bloom.
Sharks existed before Saturn got its rings.
The inventor of the post-it note originally wanted to create a strong adhesive.
The sun accounts for 99.
86% of the solar system's mass.
Some species of frogs can be frozen solid and still survive.
Penguins have an organ above their eyes to filter salt from sea water.
Earth's magnetic field flips every 200,
000 to 300,
000 years.
The fastest land animal is not the cheetah.
It is the peregrine falcon in a dive.
Platypuses don't have stomachs.
Crocodiles can go through over 3,
000 teeth in their lifetime.
Penguins can drink sea water.
Ostriches can run faster than horses.
Dragonflies can live underwater for up to two years.
Elephants can communicate through seismic vibrations.
A day on Pluto lasts 153 Earth hours.
There are over 10 million bricks in the Empire State Building.
The first webcam was used to monitor a coffee pot.
A cat's whiskers are as wide as its body.
Lobsters pee out of their faces.
Ants can carry objects 50 times their body weight.
The thumbs-up gesture is over 2,
000 years old.
A mole can dig a hole in the ground.
A snail can dig a tunnel 300 feet long in a single night.
E is the most common letter in the English language.
A snail's slime can heal cuts.
The first email was sent in 1971.
A group of bats is called a cauldron.
The average person spends about 26 years of their life sleeping.
Giraffes only sleep around 30 minutes per day.
Humans are the only mammals that will willingly delay sleep.
Sea otters hold hands while sleeping to avoid drifting apart.
Dreams can last from a few seconds to over 30 minutes.
The record for the longest time without sleep is 11 days.
You can't sneeze while you're asleep.
12% of people dream entirely in black and white.
Dolphins sleep in the middle of the night.
With one eye open.
Your brain is more active while you're asleep than when you're awake.
Snails can sleep for up to three years.
The older you get,
The less sleep you need.
Sleepwalking is more common in children than adults.
Koalas sleep up to 22 hours a day.
Lack of sleep can shrink your brain.
Cheese before bed doesn't give you nightmares.
It might actually improve sleep.
The word sleep comes from the old English sleipan.
Most dreams are forgotten within five minutes of waking up.
Sharks sleep while swimming.
The inventor of the chocolate chip cookie sold her recipe for a lifetime supply of chocolate.
A single bat can eat up to 1,
000 mosquitoes in one hour.
Snails have four noses.
Male penguins propose to females with rocks.
The moon is moving away from Earth by 1.
5 inches per year.
Octopuses have copper-based blood,
Which is blue.
The first hot air balloon passengers were a sheep,
A duck,
And a rooster.
A lion's roar can be heard up to five miles away.
Human teeth are just as strong as shark teeth.
A starfish doesn't have a central brain.
Kangaroos can't hop backward.
Sloths are so slow that algae can grow on their fur.
Octopus ink is a mix of mucus and melanin.
A goldfish can distinguish between classical music and jazz.
A cat's purring can heal its bones.
All clownfish are born male.
Male platypuses are venomous.
The Great Wall of China isn't visible from space.
Sharks don't have vocal cords and can't make sounds.
A kangaroo can't hop if its tail is lifted off the ground.
The word salary comes from salt,
As Roman soldiers were paid in it.
An eagle can kill a young deer and fly away with it.
