Why some scientists say physics has gone off the rails
The 20th century was a remarkably productive one for physics. First, Albert Einstein's theory of general relativity helped us view gravity not as a force but as a distortion of space. Then Max Planck, Erwin Schrödinger and Werner Heisenberg gave us quantum mechanics — and a fresh understanding of the subatomic world. In the middle of the century, two new forces were discovered deep within the atom (the strong and weak nuclear forces). Finally, in the century's last decades, we got the Standard Model of particle physics — an accounting of all the particles and forces known to exist in our universe.
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