The public can once again get a close look at scientists working to uncover the bones of saber-toothed cats, mastodons and mammoths in the heart of Los Angeles. Officials at La Brea Tar Pits are reopening a shuttered exhibition hall and reactivating an excavation site, allowing visitors to look on as workers dig for prehistoric fossils from a pool of naturally occurring asphalt called Pit 91. Digging was halted there in 2007 so scientists could focus on another project. Of the five million fossils uncovered at the tar pits, almost a million came from Pit 91.
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