Richard Hammond's Brain Reaction will be hosted by Richard Hammond along with some intellectual help from his brainy side-kick, Comedian Ria Lina.  Each week, a team of comics and celebrities led by team captains Johnny Vegas and Victoria Coren Mitchell will battle it out trying to make sense of the world through brilliantly bizarre conundrums. Ever wondered what's fastest; an athlete or a flame ripping along a trough of petrol? Or whether a rugby player could push forward against a fireman's hose? In this show, your next-door neighbour's got as much chance of getting the answer right as an Astrophysicist – which is just as well...