Well

Biodiversity loss, global warming, pollution and the spread of invasive species are making infectious diseases more dangerous to organisms around the world.

Ahead of Mother’s Day, the advice columnist John Paul Brammer (a.k.a. ¡Hola Papi!) has a reminder: Loving your abuela doesn’t have to mean telling her everything.

People with two copies of the gene variant APOE4 are almost certain to get Alzheimer’s, say researchers, who proposed a framework under which such patients could be diagnosed years before symptoms.

The city, which put inclusivity at the center of its bid, has improved access for people with disabilities, but with the opening ceremony about 12 weeks away, obstacles remain.

Recent studies cast doubt on whether large-scale mental health interventions are making young people better. Some even suggest they can have a negative effect.

Gov. Kristi Noem suggested that President Biden should have euthanized the family dog, as she did. Animal experts said that such an option should be a last resort.

Caroline Crampton shares her own worries in “A Body Made of Glass,” a history of hypochondria that wonders whether newfangled technology drives us crazier.

A genetic analysis sheds light on when the outbreak began, how the virus spread and where it may be going.

Older daters are not getting adequate screening and protection from S.T.I.s. Here’s how to be a safer sexually active senior.

Step one: Manage your expectations.