Group Seeks Help From Social Networks to Combat Hate Speech

Yahoo, the languishing tech pioneer, officially unveiled its acquisition of social blogging platform Tumblr on Monday. The $1.1 billion purchase by Yahoo could mean a whole world of things for both of the Internet companies, as well as for Yahoo chief executive -- and former Google executive -- Marissa Mayer.

Dubbed "Peace Corps for geeks," Code for America sends teams of tech professionals to spend a month in a U.S. city listening to officials and residents explain a specific civic challenge. Fellows then return to San Francisco headquarters to develop a web-based program they think will help.

Although the brood II cicadas aren't expected to emerge en masse until late May or June, a nice crop of them nested in a batch of poison ivy in Virgina’s Bull Run Regional Park on Thursday. Their veiny golden wings and bright beady red eyes clung to grass, leaves and tree bark.

Researchers at Oregon Health and Science University have achieved a longtime goal. They cloned a human embryo to derive embryonic stem cells able to transform into tissues and organs genetically identical to patients who need them. Jeffrey Brown talks to NPR's Rob Stein about the science as well as the ethical concerns.

The drought shows signs of lifting in the East -- but the forecast shows more trouble ahead as the drought is expected to intensify in the West and Central Plains this summer, according to NOAA.

Canadian Space Agency Commander Chris Hadfield discussed his four months on the International Space Station during his first press conference since returning to Earth. He also spoke of the peril of re-adapting to gravity. He's even had to change the way he speaks. "I hadn't realized I'd learned to talk with a weightless tongue."

Scientists have found water trapped in lunar rocks. But where did it come from? And how did it get there? A new study last week says it may have come from Earth more than 4 billion years ago.

Author Nicco Mele's new book, 'The End of Big,' explores how technology has made the world a smaller place, opening up new opportunities for local politics, small business and average citizens to wield influence. Political editor Christina Bellantoni talks to Mele about his work and the ways technology impacts our democracy.

Commander Chris Hadfield is a great many things: photographer, educator, social media maven -- did I mention astronaut? Add troubadour to the laundry list. That his music video -- a cover of David Bowie's "Space Oddity" -- has already scored 6.6 million hits is a testament to his success as a popularizer of science and space.

Google's Eric Schmidt and Jared Cohen will discuss their new book, "The Digital Age: Reshaping the Future of People, Nations and Business," in a live Google Hangout with PBS NewsHour at 2:30 p.m. ET, Tuesday, May 14, 2013. Got a question for the Google Executive Chairman or Director of Google Ideas? Tweet them using #DigitalAge.