From topcoder.com:

Welcome to the Asteroid Grand Challenge Series sponsored by the NASA Tournament Lab! The Asteroid Grand Challenge Series will be comprised of a series of topcoder challenges to get more people from around the planet involved in finding all asteroid threats to human populations and figuring out what to Thus you can get the best benefit from the medicine. viagra delivery canada It is also advised to have this medicine viagra sans prescription canada an hour before lovemaking. As an illustration, in case you will definitely find Tadaga medication in its websites levitra discount prices for great relief from ED. It appears in the US, at this point, that the price amerikabulteni.com levitra 40mg of freedom IS freedom. do about them. In an increasingly connected world, NASA recognizes the value of the public as a partner in addressing some of the country’s most pressing challenges. Click here to learn more and participate in our debut challenge, Asteroid Data Hunter!

NPR has an article about the series here.