Today is redhead, robo-babe, and Mythbusters cast member Kari Byron's 40th birthday! Personally, I don't think her body looks a day over 21, but I would need to confirm that with some hands-on research.
Kari, for me, has always been the best part about the Discovery Channel program - and Kari's best parts have always been on display.
If you know a guy who thinks Kari is hawt - and really, which guy doesn't - and was born on this date, remind him he shares a birthday with her. He will thank you for it, before rushing to Google images.
Similarly, today is Joseph Stalin's special day, so if someone you despise shares the date, remind them of that.