Matt Smith turns 30 this Sunday! Here he is receiving a TARDIS-shaped birthday cake at MCM London Expo. Happy Birthday, Matt!

We've got a badass over here, and his name is Neil deGrasse Tyson. Happy 54th birthday!

Leonard Nimoy, the actor, poet and photographer best known as Star Trek's most famous vulcan, Spock, turned 81 today.

Nimoy announced his retirement from Star Trek conventions last year, but he'll make another appearance as the voice of Spock on this Thursday's episode of The Big Bang Theory.

He retired from acting in 2003, and has since shifted his artistic focus to his photography, although he still appears in the occasional commercial or music video.

It's a cliché, but there's nothing else to say on Spock's birthday: live long and prosper, Mr. Nimoy.