My wife and I just got back from the Smithsonian in Washington, D.C. where we watched Enter Life several times. It's maybe a 5 minute animated show about how basic elements came together on Earth some 4 and a half billion years ago and started the cycle of life. The animation is a lot of fun and we've been singing the "CHON" (Carbon-Hydrogen-Oxygen-Nitrogen) song ever since.
We also visited the National Zoo where there's an exhibit called "Amazonia". I now see on IMDb that the creator of Enter Life also did a short called "Amazonia", which I'm guessing is the film used at the zoo. Unfortunately we missed this show, but if it's as good as Enter Life, we'll just have to make a return trip to D.C. to see it!
If you go to D.C., you simply must visit the Museum of Natural History and see Enter Life. We'll definitely be back!