Thousands of Americans believe they experienced rare but serious side effects. But confirming a link is a difficult task.

All vaccines have at least occasional side effects. But people who say they were injured by Covid vaccines believe their cases have been ignored.

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.