1903

1845–1958	Germany [earth sciences]	German naturalist and explorer Alexander von Humboldt lays the basis of modern geography with the publication of Kosmos/Cosmos, in which he arranges geographic knowledge in a systematic fashion.
1902–1903	Europe [sports]	Henry Lunn, the English founder of the Lunn travel agency business, pioneers skiing holidays and skiing races through the Public Schools Alpine Sports Club.
1903	Germany [companies and organizations]	The Krupp metalworking industries are founded in the Ruhr region of Germany.
1903	[philosophy]	English philosopher G E Moore publishes his influential study of ethics Principia Ethica/Principles of Ethics.
1903	UK, New Zealand [physics]	New Zealand-born British physicist Ernest Rutherford discovers that a beam of alpha particles is deflected by electric and magnetic fields. From the direction of deflection he is able to prove that they have a positive charge and from their velocity he determines the ratio of their charge to their mass. He also names the high-frequency electromagnetic radiation escaping from the nuclei of atoms, first discovered in 1900, as gamma rays.
c. 1903	United Kingdom [postal services]	Postcards become very popular in Britain as more people go to the seaside for holidays.
1903	USA [consumer products]	US manufacturer King C Gillette patents disposable safety razor blades.
1903	[psychology]	Russian physiologist Ivan Pavlov describes learning by conditioning. Whilst researching digestion Pavlov observes that a dog salivates when food is in its mouth – an example of an unconditional reflex. However, he notices that when accustomed to a feeding routine, dogs salivate at meal times even before food is given to them. If a bell always rings before food appears, the dog soon salivates at the sound of the bell even in the absence of food. The work establishes that reflexes can be conditioned (trained).
1903	United Kingdom [roads]	The problem of traffic congestion in London, England, leads to a review of the road network and extension of the recently opened underground system.
1903	[social theory]	US writer and feminist Charlotte Perkins Gilman publishes The Home: Its Work and Influence.
1903	[solo and chamber music]	The French composer Maurice Ravel completes his String Quartet in F.
1903	[fiction]	The US writer Jack London publishes his novel The Call of the Wild.
1903	[fiction]	The satirical novel The Way of All Flesh, by the English writer Samuel Butler, is published posthumously.
1903	[fiction]	The US writer Henry James publishes his novel The Ambassadors and the story ‘The Beast in the Jungle’.
1903	USA [information technology]	The Telegraphone, the first magnetic recorder, is launched in the USA. It is initially intended for office uses such as recording telephone messages and dictation. Though limited in scope, its technology forms the basis of current telephone answering machines.
1903	USA [literature and language]	A donation from the US newspaper publisher Joseph Pulitzer is used to found the Columbia University Graduate School of Journalism, in New York City, and the Pulitzer prizes, awarded annually for outstanding achievement in journalism, letters, and music.
1903	[medicine]	Dutch physiologist Willem Einthoven invents the string galvanometer (electrocardiograph), which measures and records the tiny electrical impulses produced by contractions of the heart muscle. He uses it to diagnose different types of heart disease.
1903	United Kingdom [motor vehicles]	The first motor taxis in London, England, appear.
1903	United Kingdom [motor vehicles]	The first driving licences in Britain are introduced. They must be renewed annually.
1903	[births and deaths]	George Orwell (Eric Arthur Blair), English novelist who wrote Animal Farm and Nineteen Eighty-Four, born in Motihari, Bengal, India (–1950).
15 March 1903	Nigeria, United Kingdom [colonies and mandate]	British forces under Colonel Morland complete the conquest of northern Nigeria by taking the key Nigerian town of Sokoto from the emir of Kano.
8 May 1903	[births and deaths]	Paul Gauguin, French post-Impressionist painter, dies in Atuona, Hiva Oa, Marquesas Islands, French Polynesia (54).
31 May 1903	USA [natural disasters]	The flooding Kansas, Missouri, and Des Moines rivers kill more than 200 people and leave 8,000 others without homes.
June 1903	USA [companies and organizations]	Henry Ford combines with John and Horace Dodge and nine others to establish the Ford Motor Company in Detroit, Michigan, making the city the ‘motor capital’ of the world.
19 June 1903	[births and deaths]	Lou Gehrig, US professional baseball player, born in New York City (–1941).
1 July - 19 July 1903	France [sports]	The Tour de France cycling race is run for the first time, organized by Henri Desgrange, editor of the French cycling magazine L'Auto. Twenty-one of the 60 entrants finish the 2,428-km/1,509-mi race, with Maurice Garin of France the winner.
4 July 1903	USA, Philippines [communications]	Honolulu, USA, and Manila in the Philippines are linked by undersea cable. US president Theodore Roosevelt inaugurates transpacific communications by sending a message around the world via San Francisco, Honolulu, and Manila. It takes 12 minutes.
20 July 1903	[political events]	Following the death of Pope Leo XIII, Giuseppe Sarto is elected Pope Pius X.
8 August 1903	USA [aircraft]	US astronomer and physicist Samuel Pierpont Langley achieves the first flight of a heavier-than-air vehicle powered by a petrol engine. It is uncrewed and flies 300 m/1,000 ft in 27 seconds.
1 October - 13 October 1903	USA [baseball]	The baseball World Series, between the winners of the American League and the National League, is inaugurated in the USA. The first title is won by the Boston Red Sox of the American League, who beat the National League's Pittsburgh Pirates by five games to three.
28 October 1903	[births and deaths]	Evelyn Waugh, English satirical novelist, born in London, England (–1966).
31 October 1903	USA [political events]	A group of US and Panamanian partisans stage a rebellion in Colombia near the site of the proposed Panama canal. The US Navy prevents the Colombian military from entering the area. Three days later the Republic of Panama is declared.
17 November 1903	Russian Empire [political parties]	The Russian Social Democratic Party splits into the Mensheviks (‘minority’), led by Grigory Plekhanov, and the Bolsheviks (‘majority’), led by Vladimir Ilyich Lenin, at their London congress. The latter group favours a violent seizure of power.
8 December 1903	[aircraft]	US astronomer and physicist Samuel Pierpont Langley attempts his manned first flight. His plane, with a wing span of 13 m/40 ft, weighing only 386 kg/850 lb (including pilot), and powered by US aeronautical engineer Charles Manley's engine, snags on takeoff and plunges into the Potomac River just nine days before the Wright brothers make their first successful flight. It is reconstructed several years later and successfully flown by US aviator Glenn Curtiss.
17 December 1903	USA [aircraft]	US aviator Orville Wright makes the first successful flight in an aeroplane with a petrol engine at Kitty Hawk, North Carolina, covering 37 m/120ft in a flight lasting just 12 seconds. During the day, Orville and his brother Wilbur make a number of flights, the longest covering 260 m/852 ft and lasting 59 seconds.
30 December 1903	USA [theatre and dance]	A fire at the Iroquois Theater in Chicago, Illinois, during an Eddie Foy performance, kills 588 people. The public outcry helps lead to the passage of theatre safety codes in many US cities.