Earth is the only planet not named after a god.

Sound travels faster in water than in air.

A teaspoon of a neutron star weighs about a billion tons.

The human brain uses more energy than a computer.

DNA is 6 feet long inside every cell.

Gold can be made from lightning strikes in clouds.

Your body has enough carbon to make 9,000 pencils.

Space is completely silent.

You can’t burp in space.

The speed of light is 299,792 km per second.

Jupiter has 79 moons.

Water can boil and freeze at the same time.

Fire needs oxygen, fuel, and heat—called the fire triangle.

Helium makes your voice high because it changes sound speed.

Plants turn sunlight into food through photosynthesis.

Earth’s core is hotter than the sun’s surface.

Human bones are stronger than steel.

Rain has a smell—called petrichor.

Every snowflake has a unique shape.

The Milky Way galaxy is 100,000 light-years wide.