There are many qualities that make a great leader. But having strong beliefs being able to stick with them through popular and unpopular times is the most important characteristic of a great leader.

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The birth of science as we know it arguably began with Isaac Newton's formulation of the laws of gravitation and motion. It is no exaggeration to say that physics was reborn in the early 20th-century with the twin revolutions of quantum mechanics and the theory of relativity.