Reading the Pain Written in the Bones

Amid the din of construction and city traffic, Jacqui Friedling walks across 13,000 square feet of quiet: the excavation of an 18th-century burial ground. She stops and picks up a single tooth lying on the bare ground -- an incisor with a square notch cut from the crown. A slave's tooth, she can tell. Possibly traders captured the slave in Central Africa, where notching incisors was a custom.

Ms. Friedling is 34 years old. Since 1989, her senior year at the University of Cape Town, she

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