Even if humanity never returns to the Moon, veterans of the lunar missions will still be around for hundreds, maybe even thousands of years. That's because the Apollo 14 astronaut Stuart Roosa brought hundreds of seeds with him to the Moon, and many of these were later planted to create the so-called Moon trees. The only problem? No one is exactly sure where they are anymore.
Roosa and the seeds never actually stepped foot on the Moon - they stayed up in the command module and made thirty-four orbits of the Moon while fellow astronauts Alan Shepard and Edgar Mitchell headed down to the surface. Roosa's background was a smokejumper, a firefighter who parachutes into the middle of wildfires to put out the inferno from within. As such, he had a fondness for trees, and was easily persuaded to take the seeds with him.