“You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat.”

German-born theoretical physicist

Albert Einstein was a German-born theoretical physicist known for developing the theory of relativity. He also made major contributions to quantum theory and was awarded the 1921 Nobel Prize in Physics for his work on theoretical physics, especially his discovery of the law of the photoelectric effect. Einstein is closely associated with mass-energy equivalence, expressed in the formula E = mc2, which comes from special relativity and has been called the world’s most famous equation. His work reshaped modern physics and continues to define how his name is remembered.