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But Einstein wants to understand the real world. And the real world hasn't work that way.
Einstein realized that his theory fail for accelerations. But in our universe, everything is accelerates, on a bumpy road, jet planes, and a subway car. Everything is acceleration. So there is a defect that is special relativity.
On Einstein's imagination, if his speed varies at all, his theory, his motion of how object behave in time and space falls apart.
His scientific bind wants to apply to all cases.
Einstein knows that for his theory to work, he has to account for everything in the universe, and that includes the pervasive and invisible force that holds everything together.
Gravity, gravity is everywhere. Gravity holds us to the floor. Gravity holds the suns together, the solar system together. Where was gravity in special relativity.
Einstein wants to expend his special theory relativity into a general theory relativity, theory that was not just explain time but also gravity. He realizes he will be fighting more than 2 centuries scientific front and his hero Sir Isaac Newton.
It's 1907 and the 20 year old Albert Einstein is still a patent office bureaucrat. It has been 2 years since he published his special theory of Relativity. And the ambitious Einstein decide to invent even more radical interpretation of the universe, a general theory of relativity. Doing this will require him to take on his scientific hero Sir Isaac Newton.
In Einstein's time, Isaac Newton was god.
Newton was the founder of modern science. This is actual the first edition of Newton's contribute of Mathematic, 1687. This is priceless article. It is the very very famous book that becomes the foundation of the universe physics for centuries until Einstein's upset the apple code.
It has been almost 250 years since the apple fall from the legendary tree on Isaac Newton stayed, giving Newton the inspiration to formulate his law of gravity.
Newton says that form upset falls is because of a mysterious force called gravity pulling. 

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