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The host of KPFK's Global Village brings samba, reggae and more to weekends on All Things Considered.

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.

For some, it's a symbol of America's might. For others, it's a frightening weapon of warfare. For many target-shooting hobbyists, it's "the Mr. Potato Head of firearms" — customizable to fit each individual. And it's all part of what is now a nearly billion-dollar business in military-style weapons.

The city has torn down all of its high rises and says it's close to completing its plans to transform public housing. Chicago leaders want to use public housing funds to build not just homes for poor families, but stores as well. However, some say that breaks a promise to provide affordable housing.

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.

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.

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: Lemony Snicket on storytelling; the best books coming out this week.

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.

After more than three weeks of anti-government protests, Turkey's leaders insist they will restore order and quickly bounce back from any damage to the country's economy or image abroad. The crisis comes at a delicate time for Prime Minister Recep Tayyip Erdogan. He is in the midst of a fragile peace initiative with the Kurdish minority, dealing with an escalating war next door in Syria, and trying to convince parliament to strengthen the office of the president, which he is expected to run for as his final term as prime minister winds down.