19th century: electromagnetism, the voltaic pile, the double slit experiment for the light wave theory 20th century: general/special relativity, radioactive de

19th century: electromagnetism, the voltaic pile, the double slit experiment for the light wave theory 20th century: general/special relativity, radioactive decay, discovery of the electron 21st century: crisp and deep learning Hard to argue that the big science of the first 20 years of the previous century looks way more impact than crisp and deep learning put TOGETHER.