Get your Slartibartfast on and attempt to craft a planet which can sustain human life, with your naked pal Astro-Ferret in this bit of Flash amusement from NASA. Aimed at grade school kids, but pretty neat if you have any interest in astrology, geology, or avoiding your work for about 15 minutes. Our planet crafted from Fig Newtons and rum was deemed not viable to sustain life, which frankly makes us angry at NASA, who we'd like to point out have lost at least one more expensive space probe owing to mixing up meters and feet than we have.

Astroventure [NASA]