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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, 21 December 2017

Build a Thermoelectric Generator, Like the Ones That Power Deep Space Missions

Thermoelectric generators with no moving parts are small and reliable—which makes them perfect for spacecraft like Voyager and Cassini.

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