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Here's your recap of what happened in the leadership shakeup at the Centers for Disease Control and Prevention this week.

Airstrikes have helped push back the Islamic State in some places, but the group has gained in other areas. Pentagon officials say the U.S. operation may need another two years or more to succeed.

They were talented, idealistic risk-takers on the road to what they thought would be important medical discoveries. But when the funding for risk-takers dried up, these two academics called it quits.

Donald Trump named a conservative media provocateur to lead his campaign — in the third major shakeup during the election season. David Greene talks to senior Trump adviser Boris Epshteyn.

Xinjiang has nearly 20,000 glaciers, half of China's total. They're all receding at a record pace — and will continue to melt, some scientists warn, even if global temperatures stop rising.

Thirty-two years after a deadly earthquake, a magnitude 7.1 temblor rattled Mexico City and surrounding areas. Residents had marked the anniversary of the 1985 quake earlier in the day with drills.

The bidding period has closed for the companies hoping to design and deliver the president's signature campaign promise. Here's a glimpse of some proposals — from wire mesh to 30-foot pipe organs.

A new study by three media scholars reveals how the social protest movement spread on Twitter, with some fascinating — and sobering — findings.

The Supreme Court hears arguments on the ban Wednesday, and a bipartisan group of former national security officials from the Reagan to Obama administrations are urging the court to strike it down.

Amazon is working on a whittled-down list of cities where it might build the second headquarters. Among the bidders, Washington, D.C., stands out for competing against two of its next-door neighbors.