"the great Einstein had a tough time early life" - discuss
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In 1902, Einstein's father died, leaving him to care for his mother and sister, which was incredibly difficult because he was unemployed.
Even with his physics teaching diploma, Einstein could not find work in academia and was thwarted by his initial efforts to attain higher education - a doctoral degree - which would have helped him in job hunting.
Instead, he took a position as a clerk at the Federal Office for Intellectual Property patent office in Bern, Germany in 1903 - two years before he introduced his Special Theory of Relativity.
But it wasn't until the end of 1905 that Einstein developed his most-famous equation.
Subsequently, 1905 was dubbed Einstein's "miracle year". Before the year was up, he published a fifth paper, which included an addendum to his earlier one on the Special Theory of Relativity.
The addendum identified a novel relationship between energy and mass, which ultimately spawned the most famous equation in the world: E=mc2.