The 2015-2016 year is the centenary of Einstein’s General Theory of Relativity. Einstein attributed the formulation of the principle of the relativity of motion to Galileo. Einstein published a formal synopsis of the General Theory in Annalen der Physik in May 1916, entitled “Die Grundlage der Relativitätstheorie” (On the Theory of General Relativity). The signature of Albert Einstein appears on a letter appealing for aid to educate citizens about the social implications raised by the new atomic physics. The 1905 volume of Annalen der Physik contained four papers by Einstein, including his announcement of the special theory of relativity.