Scientists believe drugs take over mechanisms in the brain which form memories, potentially offering one explanation for substance abuse and addiction.  

Multiple sclerosis affects 400,000 people in the United States.

Perrottetinene is believed to light up the same parts of the brain as the psychoactive ingredient in cannabis.

"Rarely does adenovirus get this nasty," a specialist said.

Organic food is produced without the use of synthetic fertilizers, pesticides, genetically modified organisms, and the use of veterinary medications.

Psychologists investigated how a person's attitude toward a partner affected the decision to end a relationship that was no longer satisfying.

Researchers analyzed stool samples from eight countries.

Distributing clean needles and offering HIV tests may sound like a way to encourage drug abuse. But "harm reduction" has been shown to reduce the number of overdoses and the spread of disease.

Twenty-five percent of the students surveyed showed clinically significant levels of stress.

Triple-negative breast cancer often affects young women.

A survey revealed at "a devastating litany of the challenges" women face when seeking diagnosis and treatment for the disease.

Many said the move was intended to erase the recognition of transgender Americans.