Heather Hansman

Fights over the Colorado River's most significant tributary are longstanding, intractable, and only getting worse.

A new study links oxytocin, the hormone most commonly associated with social bonding, and the one that your body produces during an orgasm, with muscle regeneration.

How single-use injectable contraceptives could change family planning in Africa.

Researchers find a universal positivity bias in the way we talk, tweet, and write.