From the bestselling author of Why is Snot Green comes another hilarious, bonkers and brilliant science book - find out the answers to all the questions you've ever had about the Olympics and sport!Are Olympic athletes born stronger and faster than the rest of us? Why do tennis rackets have strings? How do gymnasts balance on their hands? Why do hurdlers do the splits when they jump?From running a marathon, to beating your friends at basketball, to being the bendiest gymnast around, find out everything you've ever wanted to know about sports, and exactly what it is that makes...