As the war in Afghanistan enters its final chapter, Sean Smith's brutal, uncompromising film from the Helmand frontline shows the horrific chaos of a stalemate that is taking its toll in blood
Did an apple fall from a tree and hit Issac Newton on the head thus prompting the great physicist to discover the law of gravity?
Almost certainly not.
But watching a falling apple did concentrate his mind and lead him, during the late 1660's, to formulate the theory that gravity operates in an inverse-square proportion. If this was true, Newton deduced that it would be possible to predict the planet's orbital periods. He therefore named the force "universal gravitation".
