Gravity is a force that pulls objects toward each other, and it's what keeps you on the ground and makes things fall down. It's the reason planets orbit the sun and the moon orbits Earth.

Tap to flip back

Humans evolved from earlier primate ancestors over millions of years through a process called evolution, where small genetic changes accumulated and natural selection favored traits that helped survival and reproduction. Scientific evidence shows humans share a common ancestor with other apes and evolved in Africa before spreading to other continents.

Tap to flip back

Life is the quality that separates living organisms from non-living things, characterized by the ability to grow, reproduce, and respond to their environment. Something is alive if it can perform basic functions like eating, moving, reproducing, and reacting to changes around it.

Tap to flip back

The Big Bang is the scientific theory that the universe began as a single, extremely hot and dense point about 13.8 billion years ago and has been expanding ever since. All matter, energy, and space itself originated from this event.

Tap to flip back

Earth is approximately 4.54 billion years old. Scientists determined this age by studying radioactive elements in rocks and meteorites.

Tap to flip back