NASA evolution of the moon. 55 gallon steel drum can crush. Effects of complete isolation for 48 hours. Antarctic glacier collapse. Watch a killer T cell in action as it attacks a cancerous cell. Water droplets orbiting a needle in space. Scientist tests super insulating foam by taking a torch to his hand, and then eating it. The impulse to help. A spectacular view of Earth from Japanese lunar orbiter Kaguya. Minding your mitochondria. Animations of unseeable biology. Huge 48-inch shell firework. Kelly Ripa and Neil Patrick Harris inhale sulfur hexafluoride.