Editing History of science (section)

===Theory of relativity and quantum mechanics===
[[File:Albert Einstein (Nobel).png|thumb|upright|right|Einstein's official portrait after receiving the 1921 Nobel Prize in Physics]]
The beginning of the 20th century brought the start of a revolution in physics. The long-held theories of Newton were shown not to be correct in all circumstances. Beginning in 1900, [[Max Planck]], [[Albert Einstein]], [[Niels Bohr]] and others developed quantum theories to explain various anomalous experimental results, by introducing discrete energy levels. Not only did [[quantum mechanics]] show that the laws of motion did not hold on small scales, but the theory of [[general relativity]], proposed by Einstein in 1915, showed that the fixed background of [[spacetime]], on which both [[Newtonian mechanics]] and [[special relativity]] depended, could not exist. In 1925, [[Werner Heisenberg]] and [[Erwin Schrödinger]] formulated [[quantum mechanics]], which explained the preceding quantum theories. Currently, general relativity and quantum mechanics are inconsistent with each other, and efforts are underway to unify the two.<ref>{{Cite web|url=https://www.smithsonianmag.com/science-nature/string-theory-about-unravel-180953637/|title=Why String Theory Still Offers Hope We Can Unify Physics|first1=Smithsonian|last1=Magazine|first2=Brian|last2=Greene|website=Smithsonian Magazine}}</ref>