An interesting simulation to have an orbiter and lander work to arrive at a comet nucleus and drop a lander in a scientifically interesting area, observe scientifically interesting things from the lander and the spacecraft, receive data from the lander, transmit orbiter and lander data to Earth, and keep Rosetta from crashing into large chunks of comet material that spew from the surface.
An online thesaurus and dictionary of over 145,000 words that you explore using an interactive map. It's a tool for people who think visually. The most fun you've ever had with words. The Visual Thesaurus was built using Thinkmap, a data visualization technology.