Professor Young’s experiments with prairie voles revealed what poets never could: how the brain processes that fluttering feeling in the heart.

Through psychotherapy, recounted in a memoir, he learned that he had 11 personalities, or fractured parts of his identity. One of them told of childhood abuse.

For the first time, scientists observed a primate in the wild treating a wound with a plant that has medicinal properties.

But the scope of the outbreak among cattle remains uncertain, and little human testing has been done.

The outbreak linked to shelled organic walnuts distributed by Gibson Farms has sickened 12 people and hospitalized seven in California and Washington State, federal officials said.

A data analytics firm has helped big health insurers cut payments to doctors, raising concerns about possible price fixing.