How and why do mosquitoes suck our blood? Why do their bites itch ALL the time? Why do some people get bitten more than others? And do these pesky and possibly dangerous insects serve any kind of useful purpose?

More sport science: bats and black eyes
25:25

Sport science: softballs, baseballs, and curve balls
27:12

Is there such a thing as a blue raspberry? And why are raspberries hairy?
26:32