Pain is a universally known and feared human condition, yet surely it is one of the least understood. Within this century it has been a philosophic problem, an enigma of neurophysiology, a psychological puzzle, a challenge to anesthesiologists, oncologists, nurses, clinicians of all kinds; and much of what we now think we know about pain still seems contradictory and paradoxical.

Here is another puzzle: how did the most versatile and productive pain research unit at NIH establish itself in the National Institute of Dental Research?

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