Weather apps have always confused me—why look at an app to see whether it's raining? Just go outside and see for yourself! The Visibility app, while a really innovative idea, is another puzzling one.
Put a pair of Pedalites on your bicycle and you suddenly have a tiny disco lighting system flashing away under your feet. When you step on the pedals, a small generator inside pumps up their three super-bright LEDs which require no batteries.