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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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Wednesday 29 November 2017

What Is Angular Momentum, Anyway?

You can use angular momentum to describe everything from fidget spinners to back flips to interstellar asteroids. Let's see how it works.

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