Scientists have discovered the cause of the macabre "grinning corpses" found preserved in Sardinia: the hemlock water-dropwort plant, possessed of a Botox-like effect, which ancient Phoenician colonists "administered to elderly [What? -Ed] and criminals before ritualistically killing them." [LiveScience]
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Back in the hippie days, I met a guy that was testing native plants for highs. His premise was, if marijuana can get you high there must be other plants as well.
A year or two later I ran into him again and asked how the experiment was going.
"I can tell you one thing," he said quite serious, "A lot of plants will make you really sick