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. 
History of Kool-Aid (Kool-Aid Days)
Kool-Aid (Quartz)
When Elvis Helped to Conquer Polio (Politico)
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