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Do you Still Need A TV Aerial?

At the moment you need TV Aerials for Freeview and BT Vision but there is the Freesat alternative that is by a satellite dish. But I beli...

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Thursday, 23 August 2018

How Much Energy Can You Store in a Stack of Cement Blocks?

It's not a trick question: You can make a battery out of concrete by storing gravitational potential energy.

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