School integration is often thought of as something that took place in the 1960s. But the first black student to desegregate a school by court order was an Iowa girl named Susan Clark in 1868.
Of all the planets in the solar system, there’s a reason we call Earth home. It’s made of just the right stuff. It’s not too small, or too big, or too hot or too cold. It’s just right.
A battery's power comes from a chemical reaction that happens inside the cell.
Oh! Excuse me! Please pardon my sphincter, esophagus and throat.
Sleep paralysis – when you wake up but feel like you can't move – seems to be more common if you sleep on your back. But we don't know why.
Fish that live in the sea have found amazing ways to control the amount of water and salt in their bodies, and stay hydrated.
The word 'OK' has only been around for 180 years, but it's become the most spoken word on the planet.
The body tries to plug a wound quickly to stop germs getting in through broken skin and making you sick. But behind the scenes, your blood is working hard to repair a wound.
The color of American money goes back to the British colonies.
Mobile phones and tablets are basically mini computers – and to a computer, everything is a number.
Scientists have identified the world's smallest animal - for now. It could be possible smaller creatures exist that have not yet been discovered.
The truth is scientists aren't exactly sure why our fingers and toes get wrinkly in the bath. But here's what we know, and what we suspect.
How do hummingbirds drink sugary nectar and not get sick? Don't they need a balanced diet to stay healthy? Do they eat anything else?
The Romans were great engineers but they had a terrible number system. It didn’t even have zero.
Crying is something everyone does sometimes -- an expert in the history of emotions explains why people cry to express their feelings.
The white blood cells act as an army of fighting cells, protecting your body from bad cells known as germs. White blood cells can capture germs and even swallow them.
Black rats are originally from India and brown rats are originally from China.
Our body knows how it is moving and where it is because of a sense called proprioception, a 'sixth sense' that helps your body know where it is in the world. And it works even while you're asleep.
How much homework kids should do is a subject of great debate.
Have you ever walked into a room and realised you can’t remember what you were looking for? We tend to do this more when we are thinking of a few things at once or doing two things at the same time.