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Our understanding of who did what — if anything — with chemical weapons in Syria is no clearer today than it was a week ago. That's when President Obama said while there is evidence of chemical weapons use in Syria, there is none pointing to who is responsible. For more information, David Greene talks to Gary Samore, former coordinator for weapons of mass destruction at the White House. He is now the executive director of Harvard Kennedy School's Belfer Center for Science and International Affairs.

The Food and Drug Administration is expected to grant full approval to the Alzheimer's drug lecanemab by July 6. But access to the drug may still be limited.

Wednesday was the 34th anniversary of Phillipe Pettit's walk between the towers of the then-unfinished World Trade Center on a wire high above the ground without a net. Now a documentary film says it's time to remember the Twin Towers in a different way.

Philanthropist Paul Allen is giving at least $100 million to support health care workers battling Ebola. Here's a look at his goals — and at contributions from other charitable groups.

Kids read emotions better after spending several days without electronic media, according to new research.

India's Mars Orbiter Mission is set to reach Mars on Wednesday, just days after a U.S. NASA probe began its orbit around the Red Planet. The difference? India did it on a much tighter budget.

America's classrooms are seeing a surge of kids from Central America who crossed into the U.S. illegally. Educating them is expensive, and one school in New Orleans is scrambling to cover the costs.

There's a company town in Liberia with 80,000 residents. Ebola was first detected in March. Firestone's resourceful response has kept the virus from spreading.

Spain has two tiny enclaves in North Africa, separated from Morocco by fences. Both of them are hugely tempting targets for migrants from across Africa who are desperate to reach Europe.

The balance of power in the House and Senate could be upended with Tuesday's vote. We break down some of the key themes and offer a few predictions.