Richard and Jonny prove the effectiveness of the concrete bomb versus conventional explosives in their biggest and most...
(03:26)British scientists Richard Ambrose and Jonny Phillips return with a new series of this fun-but-informative show that explains...
(00:50)The evolution of the machine gun from its use in WWI to the GAU-8 Avenger, one of the deadliest machine guns in the world.
(00:34)Watch as a selection of history's most gruesome projectile weapons are tested for their accuracy and deadliness.
(01:34)Discover how weapons have been used to smash skulls for centuries in Skull Smashers.
(01:41)This time the Planet Mechanics are tackling one of the world’s biggest problems, traffic pollution.
(02:12)Now it’s time for Dick and Jem to proudly reveal their new thoroughbred delivery vehicle to the expectant new owners.
(04:55)The next morning, and the whole bike has to be stripped down to get to the heart of the problem.
(02:55)Jem’s working on the mounts for the air tanks. They’re coated with carbon fibre, a material that can’t be welded. He...
(02:55)It’s not nearly as much as Jem wanted so he’s ordered the best air motors he can find, but these motors are normally used...
(02:55)The next morning and the Planet Mechanics’ eco-workshop is up and running. Dick and Jem are in the south of England on their...
(02:52)Dick and Jem have come to this scrap heap to collect an old vehicle to recycle.
(02:52)So they’re building a moped powered by fresh air. They’ll replace the petrol engine with an air motor and the gas tanks...
(02:55)Fortunately they still have the oil they made earlier. So it’s time for the ultimate test: will that oil fire up the grain...
(01:47)A few weeks later, Dick and Jem are back and can’t wait to see how much the gas tank has risen.
(02:57)To drive the press, they’re salvaging this scrap lawnmower and will convert its petrol engine to run on biogas.
(02:57)Is there anything else on the farm they can use to fuel the grain dryer?
(02:36)Although the tank seems leak proof, Dick and Jem are taking no chances with their potentially explosive gas plant. They’ve...
(02:52)Andy has tipped them off about a tank. They could fill this with cow slurry and use it as a digester to make biogas.
(02:25)Grain can’t be stored if it’s too wet. Trouble is the average British summer means crops sometimes have to be harvested...
(03:00)