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The first tweet was posted seven years ago. Since then, the social media site has been used as a free speech platform to spread information, report on the Arab Spring and stay connected with millions worldwide. But critics say that as Twitter has grown, it has sometimes compromised its principles.

Although the gastric brooding frog became extinct in the mid-1980s, the genome of that Australian amphibian species is alive again thanks to modern biotech techniques. Michael Archer, leader of the 'Lazarus Project,' describes early efforts to resurrect extinct species.

No matter what team wins, employers are losing out. A recent study estimated the NCAA Division I men's college basketball tournament has already cost American companies at least $134 million in the first two days alone.

Science writer Carl Zimmer says we're not going to bring back dinosaurs. But we might be able to resurrect other extinct species.

A new public service announcement in New York City aimed at preventing teen pregnancy is raising eyebrows. Ads feature young children with captions such as, 'Got a good job? I cost thousands of dollars each year.' Host Michel Martin asks the beauty shop ladies if the ads are helpful or just a shame campaign.

The guitarist comes from the northern city of Gao, which has made headlines lately due to fighting by Islamist militants and French-backed Malian forces. Salah now plays at a club in Mali's capital, Bamako, where, he says, people gather to relax, reminisce and "see images other than war."

Gears of War is one of those hard-core military video games with spectacular graphics and epic stories. It's not something you'd expect to work on a smartphone or with a download, but that's just where designers are planning to take these types of games.

Detractors say extending recognition to same-sex couples will weaken a bedrock institution meant to protect women and children. The Supreme Court is set to hear arguments regarding gay marriage next week.

This week scientists announced they have reproduced the genome of an extinct amphibian, the gastric brooding frog. But animals are more than just their genomes, so NPR's Scott Simon wonders if it's necessary — or kind — to bring them back.

Toms River: A Story of Science and Salvation traces the story of a New Jersey town plagued by two generations of toxic waste dumping. Its author, Dan Fagin, talks about the origins of dumping in Toms River and its legacy today.