I am currently reading Max Tegmark's book Our Mathematical Universe. Some of you are probably familiar with this book.
On page 167, Tegmark wrote the following: "It's not only 'stuff' that's made of Lego-like building blocks. As we mentioned in Part I of this book, so is light, being composed of particles called photons, inferred by Einstein in 1905.
Four decades earlier, James Clerk Maxwell had discovered that light is an electromagnetic wave, a type of electrical disturbance. If you...