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British scientists Richard Ambrose and Jonny Phillips return with a new series of this fun-but-informative show that explains...

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.

Track the flight of a Tomahawk cruise missile and examine every key stage of its journey - launch, flight and target.

This time the Planet Mechanics are tackling one of the world’s biggest problems, traffic pollution.

The next morning, and the whole bike has to be stripped down to get to the heart of the problem.

Jem’s working on the mounts for the air tanks. They’re coated with carbon fibre, a material that can’t be welded. He...

The next morning and the Planet Mechanics’ eco-workshop is up and running. Dick and Jem are in the south of England on their...

Dick and Jem have come to this scrap heap to collect an old vehicle to recycle.

So they’re building a moped powered by fresh air. They’ll replace the petrol engine with an air motor and the gas tanks...

A few weeks later, Dick and Jem are back and can’t wait to see how much the gas tank has risen.

To drive the press, they’re salvaging this scrap lawnmower and will convert its petrol engine to run on biogas.

Is there anything else on the farm they can use to fuel the grain dryer?

Andy has tipped them off about a tank. They could fill this with cow slurry and use it as a digester to make biogas.

Grain can’t be stored if it’s too wet. Trouble is the average British summer means crops sometimes have to be harvested...

The Planet Mechanics are trying to save one of the world’s most beautiful cities – Venice.