11Harry K. Daghlian Jr. and Louis Slotin
Some physicists who worked on the invention of the atom bomb at Los Alamos died from radiation exposure, including Harry K. Daghlian, Jr. (1921–1945) and Louis Slotin (1910–1946), who both were exposed to lethal doses of radiation in separate criticality accidents involving the same sphere of plutonium.
12Sabin Arnold von Sochocky
Sabin Arnold von Sochocky invented the first radium-based luminescent paint but eventually died of aplastic anemia resulting from his exposure to the radioactive material.
13William Nelson
William Nelson (1879−1903), a General Electric employee, invented a new way to motorize bicycles. He then fell off his prototype bike during a test run and died.
14William Bullock
William Bullock (1813–1867) invented the web rotary printing press. Several years after its invention, his foot was crushed during the installation of the new machine in Philadelphia. The crushed foot developed gangrene and Bullock died during the amputation.
15Aurel Vlaicu
Aurel Vlaicu (1882–1913) died when his self-constructed airplane, Vlaicu II, failed during an attempt to cross the Carpathian Mountains by air.
16Michael Dacre
Michael Dacre (died 2009, aged 53) died after testing his flying taxi device designed to permit fast, affordable travel between regional cities.
17Jean-François Pilâtre de Rozier
Jean-François Pilâtre de Rozier was the first known fatality in an air crash when his Rozière balloon crashed on 15 June 1785 while he and Pierre Romain attempted to cross the English Channel.
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18Horace Lawson Hunley
Horace Lawson Hunley (died 1863, age 40), Confederate marine engineer and inventor of the first combat submarine, Hunley, died during a trial of his vessel. During a routine test of the submarine, which had already suffered one accident, Hunley took command. After failing to resurface, Hunley and the seven other crew members drowned. The navy salvaged the submarine and put it back into use.
19Henry Smolinski
Henry Smolinski (died 1973) was killed during a test flight of the AVE Mizar, a flying car based on the Ford Pinto and the sole product of the company he founded.
20Otto Lilienthal
Otto Lilienthal (1848–1896) died the day after crashing one of his hang gliders.
