Contents page of the journal containing Einstein's relativity theory, 1905.
© Science Museum / Science & Society Picture Library
Contents page from volume 17 of the 4th series of 'Annalen der Physik' (Annals of physics), published in Leipzig in 1905. This peridiocal, the main German journal for physics, started in 1800 and published most of Albert Einstein's (1879-1955) seminal ideas, including 'Zur Elektrodynamik bewegter Korper' (On the electrodynamics of moving bodies), his paper on Special Relativity Theory. The year 2005 marked the centenary of publication of this theory which posited that time does not exist at the same rate for everyone and everything. Special Relativity produced the equation which expresses the equivalence between matter and energy: E=mc squared.