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Albert Einstein famous qoutes

Albert Einstein, (born March 14, 1879, Ulm, Württemberg, Germany—died April 18, 1955, Princeton, New Jersey, U.S.), German-born physicist who developed the special and general theories of relativity and won the Nobel Prize for Physics in 1921 for his explanation of the photoelectric effect. Einstein is generally considered the most influential physicist of the 20th century.
Childhood And Education
Einstein’s parents were secular, middle-class Jews. His father, Hermann Einstein, was originally a featherbed salesman and later ran an electrochemical factory with moderate success. His mother, the former Pauline Koch, ran the family household. He had one sister, Maria (who went by the name Maja), born two years after Albert.
Einstein would write that two “wonders” deeply affected his early years. The first was his encounter with a compass at age five. He was mystified that invisible forces could deflect the needle. This would lead to a lifelong fascination with invisible forces. The second wonder came at age 12 when he discovered a book of geometry, which he devoured, calling it his “sacred little geometry book.”
Einstein became deeply religious at age 12, even composing several songs in praise of God and chanting religious songs on the way to school. This began to change, however, after he read science books that contradicted his religious beliefs. This challenge to established authority left a deep and lasting impression. At the Luitpold Gymnasium, Einstein often felt out of place and victimized by a Prussian-style educational system that seemed to stifle originality and creativity. One teacher even told him that he would never amount to anything.
Yet another important influence on Einstein was a young medical student, Max Talmud (later Max Talmey), who often had dinner at the Einstein home. Talmud became an informal tutor, introducing Einstein to higher mathematics and philosophy. A pivotal turning point occurred when Einstein was 16. Talmud had earlier introduced him to a children’s science series by Aaron Bernstein, Naturwissenschaftliche Volksbucher (1867–68; Popular Books on Physical Science), in which the author imagined riding alongside electricity that was traveling inside a telegraph wire. Einstein then asked himself the question that would dominate his thinking for the next 10 years: What would a light beam look like if you could run alongside it? If light were a wave, then the light beam should appear stationary, like a frozen wave. Even as a child, though, he knew that stationary light waves had never been seen, so there was a paradox. Einstein also wrote his first “scientific paper” at that time (“The Investigation of the State of Aether in Magnetic Fields”).

Albert Einstein's qoutes

Imagination is more important than knowledge.
Life is like riding a bicycle. To keep your balance you must keep moving.
If you can't explain it simply, you don't understand it well enough.
The important thing is not to stop questioning. Curiosity has its own reason for existing.
I have no special talents. I am only passionately curious.
Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.
Try not to become a man of success, but rather try to become a man of value.
In the middle of difficulty lies opportunity.
There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle.
Insanity: doing the same thing over and over again and expecting different results.
Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.
The most beautiful thing we can experience is the mysterious. It is the source of all true art and science. Read more at: Albert Einstein
graqnd unification
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Reference materials:

Classical electromagnetic theory
Analysis of matter by Russell
Quantum mechanics
Grand Design by Stephen Hawking
Higher Engineering Mathematics ( PDFDrive.com ).pdf

Albert Einstein's greatest achievement was his general theory of relativity although he was awarded Noble prize for his invention of photo electric effect. General theory of relavity gave a complete model of our universe from macroscopic point of view. It explained the evolution of our universe and its shape in terms of geometrical ideas. Solution of field equation can describe black holes and singularities.
On the other hand Newton's gravity equation is not quite right. It suffered from logical defects. Accoding to special theory of relativity there is no absolute measurement of distance. Newton's equation
newton's gravity
assumes an absolute measurement of distance r. All observers were supposed to have same notion of measure of distance. But it is not right if we take relativitic viepoint. So this equation is not valid in cosmic phenomena when two observers can have certain relative velocity between them. Einstein gave us more compelling picture of gravity through his general theory of relativity by treating gravity as the warps and curving of spacetime.
newton's gravity
Gravitational potential in Newton's theory is
newton's gravity potential
The potential takes different form according to different mass distribution.
newton's gravity potential
Gravitational force , according to Newton's theory, in spherical shell of mass is zero. It can be computed by doing integration as
newton's gravity force
Equations of gravity as a spacetime curvature take entirely different form than the Newton's. An example can make it clear
einstein's gravity force
which simplies to
einstein's gravity force
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