As part of the crew digging a Subway extension under the streets of Los Angeles, Ashley Leger always keeps her safety gear close by. Paleontologist Ashley Leger shows the skull of a young Columbian mammoth found at the construction site  of the Metro Purple Line extension in Los Angeles [Credit: Jae C. Hong/AP]When her phone buzzes, she quickly dons a neon vest, hard hat and goggles before climbing deep down into a massive...

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