History: This is the surprise that astronauts left in the space station for the next crew to find [1,966 × 2,937] Sky lab September 1973

https://i.redd.it/vqqqwztepyxx.jpg via /r/HistoryPorn https://www.reddit.com/r/HistoryPorn/comments/5d8lnl/this_is_the_surprise_that_astronauts_left_in_the/?utm_source=ifttt