Maybe it's because I turn 50 this year but I'm noticing a lot of 50th anniversaries recently. This week Disney is celebrating the 50th anniversary of the classic song "It's a Small World" written for the 1964 World's Fair.
To be honest, hearing more than about a minute of "It's a Small World" makes me kind of stabby but that's just me. If you can watch the whole video above you're a better person that I am.
Below is NASA's mercifully shorter tribute to the song.