the general theory of relativity by Albert Einstein had another 100-year basis, for example, instead of a force between masses, gravity becomes the curvature of space-time produced by mass plus energy ...

His childhood curiosities and unusual education- The scientific climate of Einstein's time and the people who influenced him- His theories, their impact, and their potential for future application- ...

Albert Einstein ... shines on it. Einstein used the very recent ideas of Max Planck to explain the phenomenon. That is, he explained it in terms of quanta, or packets of energy.