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Most commuter trains are several years away from implementing Positive Train Control system to prevent derailment. With Americans taking 490 million commuter rail trips last year, the stakes are high.

In Nairobi, people don't like getting into cabs driven by strangers. They prefer to call drivers they know or who their friends recommend. A new app assigns drivers a trust score based on social ties.

Before awarding compensation, the court wants a "preponderance of evidence" that a vaccine caused the injury. Some years, the nearly $4 billion fund earns more interest than it pays out in claims.

Under the USA Freedom Act, the NSA can no longer collect phone call metadata without a court order. Metadata remain with private phone carriers but can be subpoenaed by the government.

The Illinois Republican, who served as Speaker of the House of Representatives from 1999 to 2007, will hear charges of withdrawing funds illegally and lying to the FBI. He's not the first high-profile Illinois politician to run afoul of the law.

Developers of disaster recovery robots gathered in California this weekend to compete for a $2 million prize. Some robots shone. Many got stuck, moved at a snail's pace or fell down on the course.

There are a few populations in the world where back pain hardly exists. One woman thinks she has figured out why, and she's sharing their secrets. Have Americans forgotten how to stand properly?

Since the Supreme Court's Citizens United decision, money in politics has exploded. To make it in the 2016 presidential race, candidates need their own billionaire. Here's who's lining up with whom.

The likely 2016 presidential candidate hopes to avoid the mistakes that have haunted his rivals while separating himself from his brother.

The country's top prosecutor said investigators had been unable to find solid evidence that the U.S. eavesdropped on Chancellor Angela Merkel's phone calls.