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Autism researchers are studying post-mortem brain tissue from people with the disorder to understand how it changes the brain. The greatest demand is for tissue from children. But it's especially hard to get.

The president will visit the city's police department — most police organizations favor tougher gun laws. The president leaves behind a new Congress that's getting down to business. Consuming most lawmakers' time are the budget and deficit.

Twitter was on fire during the Super Bowl, but the twitterverse really lit up when the lights went out at the Superdome. Someone created a Twitter account named "SuperBowlLights." Many people tweeted Beyonce must have caused the failure with her electric half-time show.

The Canadian mint stops distributing pennies on Monday. Canada stopped making one-cent coins last year to cut costs, since each penny cost 1.6 cents to make. Most stores will round out change to the nearest five cents.

Also: Jared Diamond gets into trouble with an indigenous rights group; NFL players re-imagined as Dickens characters; a new theory about the Lockerbie bombing; and the best books of the week.

Chris Kyle, who wrote a bestseller about his time in Iraq and the more than 150 insurgents he killed, created a foundation that tried to help "emotionally and physically wounded veterans." The man who allegedly killed Kyle was one of those veterans, Kyle's friends and authorities say.

Unions in China are typically controlled by management and the government. A union run by democratic vote of the workers would be a huge shift.

How many presidents have chosen to affirm (rather than swear) to "faithfully execute the office ... "? Try your hand at inaugural trivia.

After the four-day hostage crisis in Algeria, the death toll has risen to at least 81. Algerian forces that were searching the natural gas plant in the Sahara that was taken over by Islamist militants found at least 25 more bodies on Sunday.

Both India and the U.S. seem disappointed with each other after the high expectations raised by President Obama's election in 2007. India is concerned about the uncertainty in U.S. policy toward China and Afghanistan.