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That's why thallium, element eighty-one, is considered the deadliest element on the table. Animal cells have special ion channels to vacuum up potassium, and thallium rides into the body via those channels, often by skin osmosis. Once inside the body, thallium drops the pretense of being potassium and starts unstitching key amino acid bonds inside proteins and unraveling their elaborate folds, rendering them useless. And unlike cadmium, thallium doesn’t stick in the bones or kidneys, but roams like a molecular Mongol horde. Each atom can do an outsized amount of damage.