Scientists map pathway from narwhals’ sensitive tusk to brain

Chip a tooth and expose a nerve and the result can be a searing sensitivity to hot and cold. The hard outer layer of a human tooth protects the sensitive nerves inside. The narwhal tusk is the structural inverse of a human tooth, rigid in the center and surrounded by a flexible outer layer containing porous tubules. Scientists have long realized the signals a narwhal receives from the nerves in…

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