Concept

1918 in science

Summary
The year 1918 in science and technology involved some significant events, listed below. June 8 – Nova Aquila, the brightest observed since 1604, is discovered. Kiyotsugu Hirayama identifies several groups of main belt asteroids, now known as Hirayama families. Harlow Shapley demonstrates that globular clusters are arranged in a spheroid or halo whose center is not the Earth, but the center of the galaxy. Heber Curtis discovers a relativistic jet of matter emerging from Elliptical galaxy M87. February 21 – The last known Carolina parakeet (the only parrot species native to the eastern United States) dies in Cincinnati Zoo. Around 1000 pilot whales strand in the Chatham Islands. R. A. Fisher puts forward a genetic model that shows that continuous variation could be the result of Mendelian inheritance in his paper "The Correlation Between Relatives on the Supposition of Mendelian Inheritance". J. Henri Fabre's The Sacred Beetle, and others published in English. Jacques Loeb's Forced Movements, Tropisms, and Animal Conduct published in the United States. February 23 – Arthur Scherbius applies to patent the Enigma machine. Edward Hugh Hebern patents the Hebern rotor machine. Technisches Museum Wien opens in Vienna. Felix Hausdorff introduces the concept of the fractional Hausdorff dimension. Gaston Julia describes the iteration of a rational function. July 26 – Emmy Noether introduces what becomes known as Noether's theorem, from which conservation laws are deduced for symmetries of angular momentum, linear momentum and energy, at Göttingen, Germany. Josef Lense and Hans Thirring find the gravitomagnetic precession of gyroscopes in the equations of general relativity. Hans Reissner and Gunnar Nordström solve the Einstein and Maxwell field equations for charged spherically-symmetric non-rotating systems. Friedrich Kottler gets a Schwarzschild solution without Einstein vacuum field equations. January – 1918 flu pandemic: "Spanish 'flu" (influenza) first observed in Haskell County, Kansas. March 26 – Dr.
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