NASA is looking for moon trees, which were germinated from seeds taken aboard the Apollo 14 mission in 1971 and subsequently planted all over the world. Because no record was kept of where all of the trees were planted, NASA scientist David Williams is asking people who know of a tree to contact him. So far, he has found 40.
I found this story from NASA Liftoff News, which offers an XML feed that isn't in RSS format. If you'd like to read this feed in Radio Userland, install my NASA XML format driver.