 Okay, Jordan, here is your last limerick. The re-entry of metals no good, because it makes much more waste than it should. When spacecrafts return, they should have a clean burn, so our satellites made out of... Wood. Yes, wood. After years of experiments, a Japanese engineer has, he says, perfected the first wooden satellite, which he hopes to launch later this year. It's part of Kyoto University's What Other Crap Can We Put in Space initiative?