The inside of sports ball
If you claim to be a sports guy (or girl!), you must like football, tennis, or baseball. You probably know everything there is to know about your favorite sport. Just have one teeny-tiny question for you: do you know what each ball looks like on the inside?
Have a quick look at this baseball, for example (which won’t look the same as a tennis ball, for instance, given that a tennis ball is hollow). This little ball can be worth a fortune, but do you know what it is made of?