Extended NFPA Hazard Diamond

Extended NFPA Hazard Diamond

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With most labs, the hushed horror stories are about something like dimethylmercury or prions, but occasionally you'll get a weird lab where it's about the soda machine or the drop ceiling.

We're pleased to announce a major update to xkcd, with new reading modes to enhance user experience. Select a mode via the menu below the comic.

Brought to you by our excellent design team: Amber, Benjamin Staffin, and Kevin.