Imagine if a naturally occurring chemical in your body could help make you feel more calm and relaxed -- but it would only work during the long days of summer. The same chemical would, instead, make you aggressive and nasty when you were exposed to less daylight during the winter. That's exactly what occurs for a specific species of mouse.

The brand name of a drug can strongly influence treatment decisions by patients, according to a randomized trial of decision aids.

A market-based incentive program to reduce global warming emissions from new cars and trucks would cut pollution as much as 33 percent and provide up to $2,500 in lifetime fuel savings for drivers, according to a new study. The Clean Car Discount program creates a schedule of fees and rebates, collectively known as "feebates," based on the amount of global warming pollution different new vehicles produce.