Bleached bones, picked clean by a lion, are left to bake under the East African sun, says the reedy-voiced British narrator on the nature film I watch from beneath a mound of covers. The abandoned bones stop the elephant matriarch in her tracks. She raises her trunk to trumpet a call of distress across the plain, lamenting the death of one once part of her herd. Elephants can remember more than 200 individual, extended family members and recognize them by smell or call, as well as sight. An elephant never forgets. From my sickbed, I watch the matriarch fondle the…