1947 in science

Anthropology

• August 7 – Thor Heyerdahl's balsa-wood raft, the Kon-Tiki, smashes into the reef at Raroia in the Tuamotu Islands after a 101-day, 4300-mile journey across the Pacific Ocean, demonstrating that prehistoric peoples could have traveled from South America.

  Astronomy and space exploration

• February 12 – Sikhote-Alin meteorite falls to earth in Siberia, the largest iron meteorite known to have impacted.
• February 20 – The first living things sent into space are fruit flies, accompanied by rye and cotton seeds, aboard a V-2 rocket launched by the U.S. Army Ordnance Corps which reaches an altitude of 68 miles.
• Bok globules are reported.

  Biology

• The Oxford Swift Research Project, based on the colony at the Oxford University Museum of Natural History, is started by David and Elizabeth Lack. It will still be running more than sixty years later.
• David Lack publishes Darwin's Finches.
• Zika virus first isolated from a rhesus macaque in the Zika Forest of Uganda.

  Computer science

• January 25 – Thomas T. Goldsmith Jr. and Estle Ray Mann file a United States patent request for an invention described as a "cathode ray tube amusement device", probably the first video game.
• July 29 – After being shut off on November 9, 1946, for a refurbishment, ENIAC, one of the world's first digital computers, is turned on after a memory upgrade. It will remain in continuous operation until October 2, 1955.
• August 18 – Official start of construction of Automatic Computing Engine in the United Kingdom.
• September 9 – A moth lodged in a relay is found to be the cause of a malfunction in the Harvard Mark II electromechanical computer, logged as "First actual case of bug being found."
• October – First recorded use of the word computer in its modern sense, referring to an electronic digital machine.

  Mathematics

• John Crank and Phyllis Nicolson describe the Crank–Nicolson method in numerical analysis.
• George Dantzig publishes the simplex algorithm for linear programming.

  Medicine

• The first antithyroid drug, propylthiouracil, is introduced in the United States.
• The first use of defibrillation on a human subject is performed by Claude Beck, professor of surgery at Case Western Reserve University.
• Mary Barber publishes her classic paper on antibiotic resistance in Staphylococcus bacteria.

  Metrology

• February 23 – The International Organization for Standardization is founded.

  Paleontology

• April 18 – "Mrs. Ples", the most complete skull of an Australopithecus africanus specimen ever found in South Africa, is discovered at Sterkfontein by Robert Broom and John T. Robinson.

  Physics

• June – The Doomsday Clock of the Bulletin of the Atomic Scientists is introduced.
• June 2 – The Shelter Island Conference on the Foundations of Quantum Mechanics convenes in New York.
• August 15 – 'GLEEP' experimental nuclear reactor runs for the first time at the Atomic Energy Research Establishment, Harwell, Oxfordshire, the first reactor to operate in Western Europe.
• December 20 – The discovery of kaon is published in Nature.

  Technology

• February 21 – Edwin H. Land demonstrates the first practical instant camera, the Land Camera, in New York. It will first be on commercial sale in December 1948.
• November – Prototype AK-47 selective-fire, gas-operated assault rifle produced in the Soviet Union by Mikhail Kalashnikov.
• November 17–December 23 – John Bardeen and Walter Brattain working under William Shockley at AT&T's Bell Labs in the United States demonstrate the transistor effect.
• December 11 – A hexagonal cellular telephone network is proposed by Douglas H. Ring and W. Rae Young of Bell Labs for mobile phones in vehicles.
• The clavioline is invented by Constant Martin.
• The disposable nappy is invented by Valerie Hunter Gordon.

  Awards

• Nobel Prizes
• * Physics – Edward Victor Appleton
• * Chemistry – Sir Robert Robinson
• * Medicine – Carl Ferdinand Cori, Gerty Cori, Bernardo Houssay

  Births

• January 24 – Michio Kaku, American theoretical physicist and popularizer of science.
• January 29 – Linda B. Buck, American biologist, winner of the Nobel Prize in Physiology or Medicine, 2004.
• February 4 – John Campbell Brown, Scottish astronomer.
• March 16 – Keith Devlin, English-born mathematician and popularizer of science.
• May 9 – Michael Levitt, South African-born computational biologist, winner of the Nobel Prize in Chemistry, 2013.
• July 5 – Lalji Singh, Indian biotechnologist and cytogeneticist.
• August 21 – Margaret Chan, Hong Kong-born physician.
• December 6 – Geoffrey Hinton, English-born cognitive psychologist and computer scientist.
• December 16 – Martyn Poliakoff, British chemist and popularizer of science.
• Stuart W. Jamieson, Rhodesian-born cardiothoracic surgeon.

  Deaths

• February 12 – Moses Gomberg, American chemist.
• February 25 – Friedrich Paschen, German physicist.
• August 23 – Roy Chadwick, English aircraft designer.
• September 15 – Annie Maunder, Anglo Irish astronomer.
• October 2 – P. D. Ouspensky, Russian-born philosopher.
• October 4 – Max Planck, German quantum physicist.
• November 17 – Emil Racoviță, Romanian biologist, speleologist and polar explorer.
• December 1
• * John Fraser, Scottish surgeon.
• * G. H. Hardy, English mathematician.
• December 17 – J. N. Brønsted, Danish physical chemist.