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Many websites and social media forums have been valued at astronomical sums. Last week, AOL agreed to buy The Huffington Post for $315 million. The sale will undoubtedly make some people rich. But most of the value was created by writers working for free.

When the town of Tracy, Calif., announced last month that it was going to start charging residents for 911 calls, many critics decried the growing practice of charging fees for a public service. It turns out Tracy is not alone; some other cities charge for calls for emergency medical treatment, and the practice is growing.

A group of hydrologists, ecologists and engineers analyzed years of research and found that mountaintop removal as a way to mine coal is more damaging to the environment and public health than the law should permit. They're urging federal and state authorities to halt or alter the practice.

French scientists report that two boys treated with gene therapy for a rare but fatal genetic disease have shown improvements. These results mark a high point for the field of gene therapy. Shown here, the area of the brain that was treated.

The revolution in Egypt brings a spirit of celebration to Egyptians all over the world, including those who live in San Diego.

Despite news of terrorist bombings, U.S. troops in Iraq and Afghanistan, and crackdowns in Syria, two recent books argue the world has never seen so little war and violence. Steven Pinker, author of The Better Angels of Our Nature, and Joshua Goldstein, author of Winning the War on War, discuss.

Spreading democracy worldwide may continue with the new president, but policies will likely look different than they did under the Bush administration. Both candidates have close ties to international democracy-promoting organizations.

Airs Thursdays, May 9-30, 2013 at 11 p.m. on KPBS TV

Antiques Roadshow is in its 14th season on PBS. We'll talk with the executive producer of the series about its continued success.

Travel enthusiasts buy thousands of coins with credit cards that award frequent-flier miles for purchases. The government picks up the tab for shipping.