Ever wondered how fast you can run? Calculate your speed in the playground along with lots of other measurements with this great app!
Scabs help stop the bleeding from a cut, but what are they made of and how do they form?
The belly button forms just a few weeks after you are born but why do we have them?
Jessi explains why it is we feel bad when we don't get enough sleep.
Have you got freckles? Ever wondered what they are or why some people have them and others don’t?