Physicists will tell you that four forces control the universe. Of
these, gravity may the most obvious, but it is also the most
mysterious. Newton managed to predict the force of gravity but
couldn't explain how it worked at a distance. Then Einstein picked
up on the simple premise that gravity and acceleration are
interchangeable to devise his mind-bending General Relativity,
showing how matter warps space and time. Not only did this explain
how gravity worked - and how apparently simple gravitation has four
separate components - but it predicted everything from black holes
to gravity's effect on time. Whether it's the reality of
anti-gravity or the unexpected discovery that a ball and a laser
beam drop at the same rate, gravity is the force that fascinates.
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