Most teens aren’t getting enough sleep, leading to poorer academic performance. Early school start times combined with natural changes in hormones and the circadian rhythm could be to blame.

Many of these digital tools aimed at women are created by, invested in and marketed by men.

Plants need light to feed themselves, so they grow in ways that help them collect as much of it as they can. Sometimes that’s straight up, but not always.

Across the US, politicians, activists and transgender people are fighting over the right to access transgender medical care. Rarely is the care itself actually discussed. This is that discussion.

It's been a stressful year, and for 61% of US adults, a year of unwanted weight change too. This isn't surprising, as stress, eating and motivation are all linked through hormones in the brain.

Scientists issued an urgent call for better federal regulation of these endocrine-disrupting chemicals. Here's why.

Wild dolphins are fast, smart and hard to study, but it is important to understand how human actions affect their health. So we are building a drone to sample hormones from the blowholes of dolphins.