Marc, Book & Brian scrutinize four big claims: a bike that can ride on water; social robots with personalities; a device that improves the reaction time of boxers; & a product claiming to give its user a healthy amount of sun without getting burned.

Brook & Brian help Mark vet four innovative products: a remote controlled lawn mower; a revolutionary digital guitar; an indestructible flashlight that powers your electronics; & a bike helmet that records brainwaves and stress levels when you ride.