The sex hormones estrogen and progesterone control the menstrual cycle. Estrogen and progesterone levels dip at the start of your period. When your period ends, estrogen levels start increasing again.

Thyroid hormones help regulate the body's metabolic rate, which is a measure of how efficient it is at using energy. When the thyroid isn’t producing enough of certain hormones, metabolism slows down; ...

The carbon cycle is the biogeochemical cycle focused on carbon and how it is sequestered in and moves between different reservoirs in the Earth system. Wildfires can increase lake carbon ...

Sweet tale celebrates friends, family, positive messages.

This important study shows that the activity of hypothalamic hypocretin/orexin neurons (HONs) correlates with body movement over multiple behaviors. Sophisticated techniques and analyses showcase this ...

Globally, primary, and secondary school enrollment rates are getting closer to equal for girls and boys (92% male, 90% female). But while enrollment rates are similar – in fact, two-thirds of all ...