A gender studies professor, diagnosed with Alzheimer’s, decides to take control of her death.

Identical twins in Pennsylvania have the same genes, the same upbringing, similar adult lives. And yet one crucial difference may have made one of them sick.

How a bioethicist’s field of study—suicide, euthanasia, a dignified death—”turned unbearably personal.”

A psychological theory emerges to explain why young Americans are taking a while to grow up.