Carl Sagan explains how the ancient Greeks knew the Earth was round and calculated its circumference over 2,000 years ago.

HOW TO SOLVE IT ; "The classic introduction to mathematical problem-solving -with a new preface." - by Ian Stewart

It doesn't matter how beautiful your theory is, it doesn't matter how smart you are. If it doesn't agree with experiment, it's wrong. - Richard Feynman

Science is a differential equation, Religion is a boundary condition.

In the history of science it has often happened that the majority was wrong and refused to listen to a minority that later turned out to be right. - Freeman Dyson

Physics; "Everyday Science At the Speed of Light" - by Isaac McPhee

Science cannot solve the ultimate mystery of nature. And that is because, in the last analysis, we ourselves are a part of the mystery that we are trying to solve. - MAX PLANCK

It is better to be wrong than to be vague. - Freeman Dyson

In 1953 at the 3rd Lindau Nobel Laureate Meeting: Hans von Euler-Chelpin, Adolf Butenant, Paul Dirac, Graf Lennart Bernadotte, Cecil Powell und Max von Laue (left to right). (📷 : Archive Stuhler )

What we observe is not nature itself, but nature exposed to our method of questioning. - Warner Heisenberg

Beauty is the first test: there is no permanent place in the world for ugly mathematics. - G. H. Hardy

"Know how to solve every problem that has been solved." - Richard Feynman

The Road to Reality; "A Complete Guide to the Laws of the Universe" - by Roger Penrose.

The truth may be puzzling. It may take some work to grapple with. It may be counterintuitive. It may contradict deeply held prejudices. It may not be consonant with what we desperately want to be true. But our preferences do not determine what's true. - Carl Sagan

Mathematical Thinking ; "For People Who Hate Math" - by Albert Rutherford