Lightning never strikes the same place twice.

Sound travels faster through water than through air.

Water boils at 100 degrees Celsius at sea level.

Humans use only ten percent of their brains.

A diamond is made of pure carbon.

Glass is a slow-flowing liquid, which is why old windowpanes are thicker at the bottom.

Cracking your knuckles causes arthritis.

Sound cannot travel through the vacuum of space.

The Sun is a star.

Summer happens because Earth moves closer to the Sun.

Earth has seasons because its axis is tilted.

Helium is lighter than air, which is why a helium balloon rises.

Hair and fingernails keep growing after a person dies.

Eating sugar makes children hyperactive.

Rust forms when iron reacts with oxygen and water.

Blood inside your veins is blue until it meets the air.

A bolt of lightning is hotter than the surface of the Sun.

Plants take in oxygen and give out carbon dioxide during photosynthesis.

Ice floats because water expands as it freezes.

Antarctica is classified as a desert.

The Moon has a side that never receives any sunlight at all.

A coin dropped from a skyscraper would kill someone walking below.

An adult human skeleton has 206 bones.

You lose most of your body heat through your head.

Oxygen makes up about a fifth of the air we breathe.

Sunlight takes about eight minutes to reach Earth.

Water spirals down a plughole the opposite way in the Southern Hemisphere.

All deserts are hot and covered in sand.

Australia is both a country and a continent.

Russia lies in both Europe and Asia.

The Great Wall of China can be seen from the Moon with the naked eye.

Vatican City is the smallest independent country in the world.

Sydney is the capital city of Australia.

The Sahara is the largest desert on Earth.

No single country owns Antarctica.

Toronto is the capital city of Canada.

The city of Istanbul sits on two continents.

The Pacific is the largest ocean on Earth.

Africa is a country rather than a continent.

Canada is the second largest country in the world by total area.

The Pyramids of Giza were built by slaves.

The Sahara Desert lies in Africa.

Viking warriors wore helmets with horns on them.

Japan is made up of thousands of islands.

Greenland is part of the Kingdom of Denmark.

The Leaning Tower of Pisa was deliberately built leaning.

Greenland is larger than the continent of Africa.

Most of the Amazon rainforest lies within Brazil.

Rio de Janeiro is the capital city of Brazil.

Mount Everest sits on the border between Nepal and China.

The Eiffel Tower was always meant to stand as a permanent monument.

Spanish is the official language of Portugal.

The Danube flows through more countries than any other river in the world.

The summit of Mount Everest is the point on Earth closest to outer space.

Iceland has active volcanoes.

Inuit people live in igloos all year round.