LUIS VON AHN, a computer scientist at Carnegie Mellon University, sold one Internet start-up to Google in 2009, and is now on to another. With the new company, Duolingo, he hopes to tap the... Read more
Other science agencies should follow NIH policy, say campaigners More than 17,000 23,000 people have signed an online petition urging US President Barack Obama to require all scienti... Read more