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Social media experts Baratunde Thurston, author of the book How to Be Black, and Deanna Zandt, author of Share This: How You Will Change the World with Social Networking, answer questions about how to behave in the digital age. This week's topic: When it comes to holiday cards, should you send them via snail mail or email?

The demonstrators have been holding the protests in response to the deaths of four students, and some are also calling for the ouster of President Omar al-Bashir.

The barbs on porcupine quills help them pierce the skin. If the bumpy needles work so well for the big rodents, couldn't they they also help doctors and nurses giving injections? Designers of medical devices are looking to try the porcupine approach.

The singer died in an airplane that crashed in the early hours of Sunday morning in Toluca, Mexico. She was a household name and feminist presence in the Latin music scene.

The planet may also be racked by wars over food and water; and individuals, equipped with new lethal and disruptive technologies, will be capable of causing widespread harm. The scenarios are the work of the National Intelligence Council, comprising the 17 U.S. government intelligence agencies.

The decision to add Jabhat al-Nusra to the list of foreign terrorist organizations is meant to marginalize extremists who are among the groups working to oust President Bashar Assad. A State Department spokeswoman said the group was an al-Qaida front.

Sen. Jim DeMint says the conservative Heritage Foundation inspired him to run for Congress. Once there, he helped to bolster its allies on Capitol Hill. Now, as he leaves Congress to run the think tank, the building blocks are there to create a powerful operation with political clout.

President Vladimir Putin's decision to sack his defense minister has created widespread speculation about his motives. The defense minister was embroiled in a scandal, but analysts say Putin's decision may point to a larger battle over the future of Russia's military.

President Obama and congressional Republicans have been trying to negotiate a deal to avert the automatic tax hikes and spending cuts known as the "fiscal cliff." But what happens Jan. 1 if no agreement is reached? Some experts say not much will happen — at least not immediately.

The Federal Trade Commission has released a report taking to task the makers of mobile apps for children. It says apps are not transparent enough about the personal information they collect. It's the latest sign the Obama administration is concerned about children's privacy online.