Scientists at Imperial College London examined the force of ball-to-head contact in soccer because it has been rarely studied compared with other types of head contact in the world's most popular sport, such as player head-to-head contact.

WSJ: Soccer 'Header' Impact Likened to Hard Punch

Other theorists, such as Georgi Dvali of New York University and Joao Magueijo of Imperial College, London, say a changing alpha might come from a hitherto unknown force of nature that could modify the law of gravity.

ECONOMIST: Fundamental physics

Napoleon, ruler of France from 1803 to 1815, rose to power by conquering most of Europe, creating an imperial monarchy and fashioning a set of laws that for the most part still stands in force today.

FORBES: Google's Napoleonic Moment