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Also: NSA is searching "vast amounts" of Americans' emails, New York Times reports; winning tickets for huge Powerball jackpot sold in Minnesota and New Jersey; rare Sumatran tigers born at Washington's National Zoo.

Scientists say the sun will reverse polarity within the next three to four months in an event that marks the midpoint of "solar max" — a period of peak solar activity.

A U.S. radar system that tracks thousands of objects orbiting Earth — from satellites to harmful debris — has reportedly been slated for a shutdown. The pending shutdown of the system, run by the Air Force, is being blamed on the government's sequestration cuts.

Dias Kadyrbayev and Azamat Tazhayakov, former classmates of Dzhokhar Tsarnaev's at the University of Massachusetts, are accused of throwing out a laptop and other items that could link Tsarnaev to the bombings.

More than half of the Major League Baseball players recently suspended for performance enhancing drug use are from the Dominican Republic - where many PED's are available over-the-counter. Host Michel Martin finds out more.

But federal forecasters trimmed their original forecast slightly, because the Atlantic waters are not as warm as predicted.

Gen. Abdel-Fattah el-Sissi led the recent ouster of Egypt's democratically elected president. Seven years earlier, he was a student at the U.S. Army War College and wrote a paper called "Democracy in the Middle East." He's the latest in a series of U.S.-trained military officers to topple a civilian government.

The owner of the encrypted email service posted a cryptic message, saying he was barred from divulging specifics.

Calling a lawsuit's potential results "absurd" for cities around the United States, Major League Baseball asked a federal judge to dismiss a challenge to its antitrust exemption filed by San Jose. The city hopes to lure the Oakland A's to relocate there.

The strikes killed at least 12 suspected militants, bringing to 31 the number killed since drone attacks were stepped up at the end of July.