Today is the birthday of Edwin Perkins, who invented a sweet drink known the world over as Kool-Aid. It's the only drink with a mascot that can smash through walls and shout "OH YEAH!" Plus: it's also the birthday of Elvis Presley, who in 1956 volunteered to be photographed getting the then-new polio shot to encourage mass vaccinations. Another way he used his immense fame as a singer to take care of business.