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Facebook profits from being frictionless, says Yaël Eisenstat. But without friction, misinformation can spread like wildfire. The solution, Yaël says, is to build more friction into social media.

Actor Don Cheadle, who starred in a movie about the Rwanda genocide of 1994, is urging citizens to speak out to help end suffering in Darfur. He is the co-author of a book that maintains that people can influence their governments to act.

In his new book, Final Countdown Pat Duggins recounts the controversial history of the shuttle program, which has been marred by two fatal disasters and exorbitant costs.

Where Three Roads Meet, the new novel from British psychologist and fiction writer Sally Vickers, is set in the spring of 1923, and features an invented encounter between the ailing Sigmund Freud and a blind, ancient soothsayer.

Black holes have become fixtures in science fiction. They’re potent symbols of mystery in part because we know so little about them.

Researchers at the Mayo Clinic evaluated about 90,000 messages between doctors and their patients and found differences in patients' responses based on the doctor's gender and area of practice.

President Bush's emergency stimulus package proposes to put cash in the hands of consumers. Most observers expect that relief to take the form of tax rebate checks. But it's not yet clear how much the checks will be for, or who will qualify for them.

As summer wraps up, we look back on the books that defined the season.

Liberal Sen. Bernie Sanders and conservative Sen. Rand Paul used a hearing on emergency room use to engage in an unusual debate about whether health care is a right.

Most hospitals make little effort to screen patients for tobacco use or to help smokers kick the habit permanently. That's a missed opportunity. Starting this month, though, hospitals can choose to adopt tobacco-cessation measures to help them comply with accreditation standards.