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Pressure cooker bombs have long been used in places such as Afghanistan and Pakistan because they are cheap, easy to build and inconspicuous. They rely on basic principles of physics to amplify their explosive power.

The days of made-to-order ice cream are far from over in San Francisco. A small shop that operates out of an old shipping container uses liquid nitrogen to freeze ingredients together in about a minute for an ultra-fresh, ultra-smooth treat.

Former South Carolina Gov. Mark Sanford is hoping to put a marital scandal behind him with a return to Congress in a May 7 special election. But just two days later, Sanford must defend himself from an accusation that he was at his ex-wife's house without her permission.

Ricin is a naturally occurring toxin found in castor beans. You can get sick by eating beans. But purified ricin can be made pretty easily and used for no-good.

President Obama delivered an angry message to lawmakers, who shot down a gun control measure.

As the day dawned, officials said an estimated 5 to 15 people were killed and more than 160 were wounded. It was feared those numbers might go higher. The cause of the fire that led to the explosion at a plant near Waco is under investigation.

Clues are still being sifted — most notably, perhaps, from video that shows a man setting down a bag and leaving the scene. No arrests have been made. Thursday morning, President Obama is at an interfaith service in Boston where the victims will be remembered.

A competition to encourage entrepreneurs to design health apps came up with a wide range of possibilities. One app audits medical bills for errors and savings. Another helps find prices for services, such as dental exams, for people without insurance coverage.

There are more than 1,400 billionaires in the world right now, according to two sources — one in the U.S., and one in China. But the tallies by Forbes and Hurun Report differ on key points, including whether there are now more billionaires in Asia than anywhere else.

The nation's last coal-fired ferry has been traversing Lake Michigan from the town of Ludington, Mich., since 1953. An EPA permit allowing the Badger to dump several tons of coal ash into the lake daily is now under review, which could mean big changes for the small town's culture and economy.