An explosion occurred on this day in 1970 during the voyage of Apollo 13 to the moon.

Many people are familiar with the famous scene in the Apollo 13 movie where engineers figured out how to fit a square oxygen filters into round ones. I’ve embedded that clip at the bottom of this post, and it’s also on The Best Videos Showing “Thinking Outside The Box” — Help Me Find More list.

Here are two good pieces telling the real story behind that “hack” (and it sounds very similar to the portrayal in the movie):

The Greatest Space Hack Ever is from Popular Science.

This is the actual hack that saved the astronauts of the Apollo XIII