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.
Bubbles in fizzy drinks are full of science you probably didn't know about - and which can even be found in volcanoes!
One of the waste products that your kidneys put into your urine is a chemical called urobilin, and it is yellow.
It helps if you imagine the ground here on Earth as a big heater. It keeps us warm, and if you move away from the heater you feel cold.
If you got too close to a black hole, it would suck you in and you'd never be able to escape, even if you were travelling at the speed of light.
This point of no return is called the event horizon.
Have a cat who just loves to scratch? Declawing is a major surgery that comes with serious long-term side effects – and it might not solve the problem anyway.
What exactly is inside those red fire extinguisher canisters, and does it work better than water?
You could jump much higher on the moon than you can on Earth – but you'd be in no danger of shooting off into space.
Hagfish have been called the most disgusting creatures in the ocean. But what are they?
Yes, the Sun absolutely spins. In fact, everything in the universe spins. Some things spin faster than the Sun, some are slower and some things spin 'backwards'.
Worrying a lot or a little has nothing to do with being brave, strong or your character.
Birds spend a lot of time and energy singing, but they don't do it the same way in every season of the year. And some can't sing at all. What's the purpose of birdsong?
The short answer is yes, but it’s really, really difficult.