A chemical nerve agent may have been found in a mail bag at Facebook's offices. Here's why sarin is so dangerous.

· *On Monday, routine tests detected sarin in a Facebook mail bag, the Menlo Park Fire Department (MPFD) said.* · *Officials say no one in Silicon Valley is showing signs of exposure yet, but the FBI has been called in to investigate as a precaution, and the mailbag that might contain sarin ...

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