Your note to the question box surprised me. Explosive Tylenol? I had not read that display in its entirety, so I took a trip downstairs to look at this exhibit.
The photo shows explosives researcher, post-doc John Yeager, indeed examining a Tylenol™ crystal. Tylenol, the medication, has a crystalline structure similar to the structure of many crystalline high explosives, but is not itself explosive. Scientists at Los Alamos who study explosives can substitute Tylenol for safety reasons in some experiments. It appears to be a pretty green color. Thank you for bringing this to my attention, I had no idea.
OTOH, Alfred Nobel suffered from terrible headaches brought about by his contact with nitroglycerine, and he died of heart disease. His nitroglycerine is the same nitroglycerine used as heart medicine today.
To be absolutely clear, Tylenol is not explosive.
