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A confidential Justice Department memo obtained by NBC News outlines legal theories the Obama administration has used to justify killing American citizens abroad. Here are five key questions and answers about the document:

1) What is it?

The Department of Justice said today that it was sticking by its decision not to pursue any charges against cyclist Lance Armstrong.

"We made a decision on that case a little over a year ago. Obviously, we've been well aware of the statements that have been made by Mr. Armstrong in other media reports. That does not change my view at this time," André Birotte, a U.S. attorney based in Los Angeles, said according to Reuters.

Rape has long been a weapon of war, but documenting sexual violence usually happens after a conflict is over. Researchers are taking a new path with the Syrian conflict: tracking the incidents of rape as they occur.

By an overwhelming majority, the British House of Commons passed a bill that legalizes gay marriage. The bill is expected to become law because it is supported by Prime Minister David Cameron.

The House passed the bill with a vote of 400 to 175.

The CBC reports:

"Same-sex civil partnerships have been allowed in the U.K. for eight years. One of the more high-profile unions is between musician Elton John and his Canadian partner, David Furnish.

Florida voters in 2010 approved constitutional amendments by nearly 2-to-1 margins that forbade state legislators from coordinating with political parties or favoring incumbents when drawing new congressional districts.

So what did lawmakers in Tallahassee do? The Republican leaders in charge of drawing new maps coordinated with Republican Party consultants to protect Republican incumbents.

Men can be forgiven for being confused over screening for prostate cancer. Doctors are confused, too.

When it comes to figuring out if the benefits are worth the risks, the simplest solutions may not be best, a study of the options finds.

While the economy will benefit from continued improvement in "underlying" conditions, the federal government's push to tighten its spending will slow overall growth in 2013, the Congressional Budget Office projects.

In an updated "Budget and Economic Outlook" reported released Tuesday afternoon, the agency forecasts:

-- 1.4 percent growth in gross domestic product this year, vs. 2.3 percent in 2012.

-- 2.6 percent growth in 2014.

-- 4.1 percent growth in 2015.

Grab a guitar, hit those three chords (A, D, E) and take three minutes to pay your respects:

Reg Presley, who sang Wild Thing with The Troggs in 1966, is dead. He was 71 and had suffered a series of strokes recently.

The band's website says Presley "died peacefully" on Monday, "surrounded by all of his family."

NPR's Neda Ulaby tells our Newscast Desk that:

Marking a new escalation in tensions between countries with the world's second and third largest economies, Japan formally complained today that China had locked a military radar on one of its ships.

The Washington Post reports this was a "brief but dangerous escalation" in a continued dispute over territory. The Post adds: