<p>In 1915, Albert Einstein unveiled his masterwork ? a theory, in his words, 'of incomparable beauty': the General Theory of Relativity. It is sometimes overshadowed ? wrongly, argues John Gribbin ? by his work of 1905, the Special Theory of Relativity and E = mc?.<br><br>Just over 100 years later, the first direct detection of gravitational radiation is seen as the ultimate proof of the General Theory's accuracy.<br><br>The General Theory descr...