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# The Evolution of Physics - Einstein & Infeld

"We are faced with a new kind of difficulty. We have two contradictory pictures of reality; separately neither of them fully explains the phenomena of light, but together they do!

How is it possible to combine these two pictures? How can we understand these two utterly different aspects of light?" (P.278)

<figure><img src="/files/OOF0sIH0NI9hBheRvS36" alt=""><figcaption></figcaption></figure>

*Albert Einstein and Leopold Infeld, The Evolution of Physics: The Growth of Ideas from Early Concepts to Relativity and Quanta (New York: Simon and Schuster, 1938)*