Last year, the National Reconnaissance Office gave NASA a gift--two declassified spy telescopes, each higher in quality than anything NASA has ever produced for space. NASA astrophysics director Paul Hertz and Caltech theoretical physicist Sean Carroll discuss how the telescopes could be used to hunt for elusive dark matter and dark energy.

In four billion years, the Milky Way and Andromeda galaxies will collide, according to a study in the Astrophysical Journal. Roeland van der Marel, an astronomer at the Space Telescope Science Institute, talks about how this discovery was made, and the fate of our solar system.

Australian researcher Scott O'Neill is leading a charge to rid the world of dengue fever. And it's a real team sport, he says: "We don't work in isolation in any projects in science these days. The days of having someone beavering away by themselves in the backroom have long gone."

Scientists have deciphered the entire genetic code of a fetus, taking a sample from the mother's blood. While less risky than current alternatives, it also leaps into the abortion debate, with parents eventually having the option to test for all kinds of traits.

Scott O'Neill's big idea to rid the world of dengue is both clever and complex: He wants to infect mosquitoes with bacteria so they can't carry the virus that causes the disease. "I was incredibly persistent in not wanting to give this idea up," he says. But advances aren't easy: "It's incredibly frustrating work."

The Foundation for the National Institutes of Health, a charity that helps raise money to support the NIH, today announced a $100,000 prize to encourage young scientists. A big check awaits an outstanding young researcher, who happens to be as old as 52.