A young reader asks: What is the sky?
The oldest known skeleton of our species Homo sapiens is about 300,000 years old. But there was a time when humans didn’t exist at all and the world was covered in nothing but slime.
Human genes are one of the main reasons we can’t grow wings. And even if humans did have wings, they wouldn’t necessarily allow us to fly.
There are two types of time travel: going back in time and going forward in time. And remarkably, people can feel time at different rates - but usually don’t notice it.
Swallowing a lot of gum can cause it to stick together or stick to food in your gut.
Are there stars other than the Sun that might explode soon close to us? Yes, there are! As long as by ‘soon’ we mean within a million years.
Dog skin is exactly the same as yours and mine! It changes colour depending on how much light it’s exposed to.