Srdja Popovic, a lanky biologist from Belgrade, helped overthrow a dictator in Serbia a decade ago. Since then, he's been teaching others what he learned, and his proteges include a host of Arab activists who have played key roles in ousting Arab autocrats over the past year.

"This is a bad year for bad guys," Popovic says with a broad grin in a New York cafe.

Human rights advocates are calling on the Obama administration to do more to protect people in immigration detention centers from sexual assault. A new federal rule that will take effect next year covers inmates in jails and prisons, but some Homeland Security officials want an exemption for facilities that house illegal immigrants.

He'd hinted that this might happen.

Physicists have a grand theory that describes how tiny particles interact to form all the stuff we see in the universe — everything from planets to toasters to human beings.

But there is one particle predicted by this theory that has never been detected in experiments. It's called the Higgs boson. Scientists are dying to know if it really exists — and now researchers are closer to finding out than ever before.

If you're considering suicide, Facebook now stands ready to get you some help.

The gigantic social-networking site said Tuesday that if any of its 800 million users type a post saying they are contemplating suicide, the site will offer to connect them to a crisis counselor through the site's chat system.

Signs suggest "that the economy has been expanding moderately" in recent months, "notwithstanding some apparent slowing in global growth," Federal Reserve Policymakers just reported.

And, as expected, they announced no policy changes that would either add or subtract to the amount of help the central bank gives the economy.

In "Fed speak":

Saying it can save taxpayers $50 million a year, the Treasury Department announced today that it is suspending almost all production of presidential dollar coins.

One day after the United Nations said that more than 5,000 people have died in nine months of protests and clashes against the Syrian government, the AP quotes activists saying that at least 28 more people died Tuesday at the hands of Syrian security forces.

Fighting between the government and the opposition was heaviest along the country's northwestern border with Turkey.

A bill before Congress that would allow some types of "robocalls" to be made to cellphones if consumers have given companies their numbers doesn't have many sponsors and wouldn't seem to be the kind of legislation that would stand much of a chance of passing when an election year looms.

But it's getting an increasing amount of attention this week thanks to something that's very rare these days — bipartisan opposition.

The federal government will stop minting unwanted $1 coins, the White House said Tuesday. The move will save an estimated $50 million a year.

Earlier this year, we reported on the mountain of $1 coins sitting unused in government vaults. The pile-up — an estimated 1.4 billion coins — was caused by a 2005 law that ordered the minting of coins honoring each U.S. president.