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Today’s excuse to bring this photo out again: @JoeBiden just joined Twitter.

My cosplay for Eruka Frog.

Now THESE are math equations I can get behind!

Here, on the anniversary of Apollo 9 completing its March 1969 mission to deploy and test a version of the Lunar Excursion Module (LEM) that would — a few months later, in another incarnation — allow Buzz Aldrin and Neil Armstrong to take their first, historic steps on the moon, LIFE.com offers a series of images celebrating the various LEMs that NASA built through the years; the men who flew them; and the brilliant, daring minds that envisioned the extraordinary spacecraft in the first place.

We took a tour of Tumblr’s “cozy” two-floor HQ in New York City. Check out their space and learn a bit about the company culture, from their meme wall art to their ping pong table and their kegerator. Thanks for showing us around, Tumblr!