Marijuana might make brain cells that normally suppress the appetite reverse their behavior and encourage eating, says a new study.
Beef prices are high, but one indicator says the pendulum could start to swing the other way.
Harsh droughts lasting decades are likely to dry out a broad swath of America's heartland, even if we reduce carbon emissions in the next 50 years, researchers say.
Coastal countries are leaking millions of tons of plastic into the oceans every year, says a new study. And it is getting tougher to remove.
Hospitals near San Francisco are using robots to ferry food, drugs and even dirty laundry, possibly saving patients money, and maybe stealing jobs.
Some environmental groups are taking issue with First Solar's new farm, in which Apple is making a big investment.
Biologists have developed a way to make burnable liquid fuel out of sunlight, by mimicking the way plants derive energy from the sun.
Several African countries report vaccination rates higher than that of the U.S., a survey found.
Outbreaks of measles and whooping cough in California have rekindled debates over "anti-vaxxers"——here is a map of where they live.
Cocaine users seem to not to feel the losses associated with bad predictions, and this may mean their brains have more trouble learning from mistakes.