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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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Friday, 22 March 2019

You Can Play With Escape Velocity—Without Leaving the Planet

Gravity is a real pain for aspiring space travelers. These equations explain how to defy it.

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