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The nation's largest insurer by revenue is buying the operations of a big doctor group practice in Calif. The deal is the latest in a string of similar purchases for UnitedHealth and is part of growing trend among insurers seeking to control medical costs.

A bug could allow hackers to install malicious software without users knowing it. Homeland Security said it did not know of a practical fix for the problem.

When news of Yahoo's purchase of Tumblr first hit, Tumblr users took their reactions online. The posts were quirky and sharp with plenty of worry about the future.

Recovery efforts are underway for six people presumed dead in the Baltimore bridge collapse. NBC has dropped a former RNC chair as a contributor after backlash from the public and its network stars.

U.N. investigators visited the site of a mass killing in Syria. Their initial report cites a targeted attack on the village of Tremseh, but have been unable to confirm the death toll. The Syrian government says it was an anti-terrorist operation and no civilians were killed. Guest host David Greene talks to NPR's Deborah Amos.

Tech companies are lining up to sell us "smart" things that learn what we might want and give it to us before we ask. But so far consumers seem wary, in part because of privacy concerns.

Also: Tracing the contradictory timeline of ex-White House staffer Rob Porter; South African President Jacob Zuma faces a no-confidence vote by parliament; and a Mt. Hood climber is killed in a fall.

Twitter, Apple, Snapchat, and Facebook are embroiled in controversies about the balance between protecting user data and cooperating with law enforcement. NPR's Arun Rath speaks with tech correspondent Steve Henn about the issue.

There are unconfirmed reports from Libya that Moammar Gadhafi has been captured or killed. Other news: All the exotic animals that escaped from a farm in Ohio have been killed, captured or accounted for.

Also: Survivors have harrowing tales after Brazilian nightclub fire; unrest continues in Egypt; Toyota regains No. 1 spot among auto companies; French and Malian forces move into Timbuktu.