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A technology called adaptive optics is enabling astronomers to peer into space as never before. The specialized telescopes, which have mirrors that can adjust their shapes up to 1,000 times per second, compensate for the blurring that happens when light passes through Earth's atmosphere.

Alzheimer's disease and depression have a lot in common, and people with depression face a greater risk of dementia as they age. Researchers aren't sure why and are seeking clues. They are trying to find out if treating depression will then help prevent or delay dementia.

The haze, caused by clear-cutting fires in neighboring Indonesia, has enveloped much of the country's south as well as the city-state of Singapore.

Online search engines that protect users' privacy are seeing a spike in traffic after the NSA surveillance revelations. DuckDuckGo, does not track users at all, says it's seen record-breaking traffic.

The former South African president, an icon of the anti-apartheid movement, remains in critical condition at a Pretoria hospital. He is being treated for a recurring respiratory infection. Mandela is 94.

Also: Opening statements due in trial of George Zimmerman for death of Trayvon Martin; NSA leader Edward Snowden thought to still be in Russia; another large wildfire continues to spread in Colorado.

It was widely reported that he would fly from Moscow to Havana on Monday. But he apparently did not board that flight. Just where Snowden is headed isn't known for sure, but it's thought that his final destination will be Ecuador.

NSA surveillance leaker Edward Snowden left Hong Kong over the weekend and is seeking asylum in Ecuador. He spent the night in Moscow where Ecuadorean authorities met him at the airport. For more on Russia's role in this journey, and the role of WikiLeaks, David Greene talks to Kathy Lally, Moscow bureau chief of The Washington Post.

Prime Minister Nawaz Sharif said Musharraf, who returned to Pakistan from self-imposed exile earlier this year, violated the constitution when he suspended it in 2007.

Major indexes in China closed down more than 5 percent Monday — making it the worst day for losses since 2009. The plunge reverberated, weighing down markets across Asia.