A couple of months ago, South Africa played host to one of the biggest gambling events in the world. The 2010 World Cup was held on South African soil, and with the tournament came millions of dollars in bets around the world.
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It is a striking fact that general relativity has remained unchanged since Einstein first proposed it in 1915. At its heart is our understanding of the force of gravity. Einstein put forward the idea that there is no force of gravity per se. Instead, what we perceive as gravity results from the geometry of space-time. If we place an object - a planet or a star, or indeed anything with mass - into space, it will deform it. Einstein's general theory of relativity gives us unique and exact rules for calculating the extent of this deformation.
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