Could nanotechnology be used to see if an artery is blocked? Or is this just science fiction?
The triathlon is a physically gruelling challenge. Can you work out which athlete burnt the most calories?
These Olympic quantities have been jumbled up! Can you put them back together again?
My measurements have got all jumbled up! Swap them around and see if you can find a combination where every measurement is valid.
A security camera, taking pictures each half a second, films a cyclist going by. In the film, the cyclist appears to go forward while the wheels appear to go backwards. Why?