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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.

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...

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...

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...

Fortunately they still have the oil they made earlier. So it’s time for the ultimate test: will that oil fire up the grain...

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?

Although the tank seems leak proof, Dick and Jem are taking no chances with their potentially explosive gas plant. They’ve...

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.

They’re worried that the engine might not be strong enough but to get the boat onto the plane, Alberto will need to give it...