Her findings led to cautions against X-rays for pregnant women. She also discovered that the presence of the Y chromosome meant a mammalian embryo was male.

Researchers found spraying oxytetracycline on orange trees didn’t halt a devastating infection called citrus greening, but a more expensive method — injecting the trunks — holds some promise.

His research expanded the pool of donors whose bone marrow was less likely to be rejected by patients with leukemia and other blood disorders.

Problems with disposal of dangerous materials led the government to suspend research at the military’s leading biodefense center.

Blame the linden trees? Maybe pesticides left by humans? Or is nature just cruel sometimes?

Dr. Barrett-Connor founded and led an important long-term study on aging, using both men and women as subjects — an unusual method at the time.

Dogs have a muscle that lets them make a face to melt a human’s heart.

Mail-in genetic tests offer a wealth of information about your ancestry and insight into medical risks — in exchange for a lot of data. Here’s where that data goes, and how to delete it.