Scientists confirm 'dry ice' snowfall on Mars

In 2008, we learned from the Phoenix Mars lander that it snows in the Martian north polar region — perhaps quite regularly — from clouds made of water vapor. But now, Mars Reconnaissance Orbiter data has revealed the clearest evidence yet of carbon-dioxide snowfalls on Mars. Scientists say this is the only known… »9/12/12 2:20pm9/12/12 2:20pm

Ten amazing (and occasionally explosive) chemical reactions, caught on video

It's fun to watch chemistry labs explode on video, but you know what's even more fun? Watching a chemistry experiment in action, with a good explanation of what's going on. That's science at its most awesome. Here are ten of our favorite chemical reactions caught on video — which also include excellent commentary on… »2/20/12 1:53pm2/20/12 1:53pm