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Einstein later said the desk on which he worked was the office of theoretical physics because
there only he started working on his inventions.

One of the famous papers of 1905 was Einstein’sSpecial Theory of Relativity, according to which
timeand distance are not absolute.

absolute: measured in itself, not in relation to anything else
In the year 1905, Einstein published his first paper. It was about ‘special theory of relativity’. In
this publication it was written that the measurement of time and distance is not absolute, it
depended on something else.

Indeed, two perfectly accurate clocks will not continue to show the sametime if they come
together again after a journey ifone of them has been moving very fast relative tothe other.

According to the theory, if there are two clocks, and both are moving, they will not show the
same time. One clock will move faster than the other.

From this followed the world’s most famous formula which describes the relationshipbetween
mass and energy:
E = mc2(In this mathematical equation, E stands for energy, m for massand c for the speed of
the light in a vacuum (about 300,000 km/s).

This theory of relativity gave us this basic formula of physics - E = mc². E stands for energy, m for
mass of the objectand c for the speed of the light in a vacuum. (Vacuum means where there is
no air and the speed of light in vacuum is almost 300,000 km/s). To put it into simpler words,
Einstein said that when you sit with a nice girl for two hours, it seems like two minutes. On the
other hand, when you sit on a hot stove for two minutes, it seems like two hours—that’s
relativity. Soa person would feel the timing differently.

While Einstein was solving the most difficultproblems in physics, his private life wasunravelling.
unravelling: starting to fail

Though he was solving the complicated problems in physics for the world, but his personal life
started becoming problematic. He started to fail in his personal life.