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Stanford physicist Carl Wieman is on a quest to bury the big lecture in favor of evidence-based techniques. But it's not clear higher education is listening.

Clean, safe drinking water is essential to life. To get that water, however, requires a sludge of chemicals, countless testings — and different treatment processes depending on where you live.

The top Republican and top Democrat on the Senate intelligence panel are floating a bill that would mandate cooperation in encryption cases, but critics say it creates a dangerous "back door."

Infrared thermal cameras have revolutionized the way rangers can see into the dark. But sometimes, experience trumps technology.

Mexico City has its worst smog in more than a decade. The government has ordered cars off the street one day a week, but city planners say that isn't a long-term solution.

Remittances — money sent home by migrants working abroad — add up to more than triple the amount of official foreign aid to developing countries. And that makes some people unhappy.

The U.S. has reached out to foes that include Cuba, Iran and Myanmar. Now the State Department weighs in with its annual report on human rights around the globe.

Edward Humes describes his new book as a "transportation detective story" that chronicles the hidden characters, locations and machinery driving our same-day-delivery, traffic-packed world.

Decisions about high blood pressure have gotten thornier over the past couple of years. There's no consensus on when to start treatment with drugs. The latest evidence adds to the confusion.

Nearly 40,000 union workers on the East Coast, who haven't had a contract since August, have walked out. Among other things, they object to outsourcing and two-month location transfers of employees.