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Senegal's capital of Dakar remains jittery, with demonstrators and police locked in running street battles. Some of the protests have been led by rap artists, who are mobilizing the youth and putting pressure on Senegal's leader to step down.

When the singers released remixes featuring each other this week, the Internet's jaw dropped.

Spring brings in one very unusual business in northern Canada: iceberg harvesting. Every spring, icebergs break off Greenland and float south.

For Facebook to live up to its valuation, the company will need to redefine advertising as we know it.

Mitt Romney won the GOP presidential primary in Ohio Tuesday night. Unlike most of the other states voting on Super Tuesday, Ohio will be a pivotal swing state in the general election.

The Obama campaign on Wednesday escalated its attack on Mitt Romney's business career, with Vice President Joe Biden scheduled to aggressively question how Romney's management of the private equity firm Bain Capital might translate into running the U.S. economy.

Egypt's presidential voting starts May 23, and two of the leading candidates are Islamists. One is a leader of the Muslim Brotherhood, and the other was recently kicked out of the group.

A new analysis of TV ads so far this election cycle finds that 70 percent of the messages have been negative — a trend spearheaded by the heavily financed superPACs supporting the candidates. At this point in the 2008 election, 91 percent of TV ads were positive.

A Pittsburgh food writer offers a lesson in making pesto out of stinging nettles and garlic mustard — springtime greens often considered weeds.

Ecologist and "natural security expert" Rafe Sagarin thinks our systems for dealing with natural disasters and terrorist attacks need to be updated. The best place to turn for advice? Other organisms.