The La Brea Tar Pits are extraordinary. I don’t know any other museum that is an active paleontological research site, where methane gas fills your nose, tar fills your outsoles (if you don’t watch your step), and discoveries are made daily, about the ice age. Crude oil seeps up from about 1,000 feet deep, and has been doing so for tens of thousands of years. The methane gas that bubbles through the thick oil pushes different fossils to the surface, aiding researchers in their studies. Since the first historic digs over a century ago, 3.5 million fossils have been excavated. No organism was spared from becoming stuck in the black goo, from mammoths to saber toothed tigers to sloths to dragonflies to miniature shells, the victims’ remains are discovered, recorded, and preserved for eternity.