The duo find out about circles, squares and triangles.
A look at the Japanese "Ski Dome", and how boomerangs work, plus a visit to the National History Museum.
Show in which viewers are encouraged to exchange ideas using webcams, video diaries, online chat and e-mail.
A look at the role of gunpowder in the success of the British in the Napoleonic Wars.
Adrian Woolfson explains how the genetic make-up of humans resembles the plans for an Airfix kit.
Bear van Beers has to take a wine-tasting test.
A look at the young British artists who have put contemporary British art on the world stage.