Why are there two high tides a day when there's only one moon? Would a planet made of glass be transparent? Does dreaming about exercise burn more calories? And what would happen to a tankful of fish launched into Earth's orbit? To find out, and to hear how the solar cells of the future can keep themselves clean, how researchers have uncovered a new way to combat cancer and how astronomers have spotted showers of meteors hitting Jupiter, join Drs Chris, Dominic and Dave as they blast off into a new series of the Naked Scientists in pursuit of the ultimate answers to your wildest and wackiest questions...