what did douglas engelbart invent?
Mouse
entailment
 Operation Sandwedge was a proposed clandestine intelligence @-@ gathering operation against the political enemies of the Richard Nixon presidential administration . The proposals were put together by H. R. Haldeman , John Ehrlichman and Jack Caulfield in 1971 . Caulfield , a former police officer , created a plan to target the Democratic Party and the anti @-@ Vietnam War movement , inspired by what he believed to be the Democratic Party 's employment of a private investigation firm . 

contradiction
 Cartier and Kneale 's first major production was the six @-@ part serial The Quatermass Experiment , broadcast in the summer of 1953 . A science @-@ fiction story , it relates the sending of the first humans into space by Professor Bernard Quatermass and the consequences when an alien presence invades the crew 's rocket during its flight and returns to Earth in the body of the one remaining crewmember , having absorbed the consciousnesses and shredded the bodies of the other two . A critical and popular success , The Quatermass Experiment has been described by the British Film Institute 's Screenonline website as " one of the most influential series of the 1950s " . Cartier 's contribution to the serial 's success was highlighted in his 1994 obituary in The Times newspaper , which also called the serial " a landmark in British television drama as much for its visual imagination as for its ability to shock and disturb " . 

entailment
 In September 1940 , with World War II raging in Europe , the British Tizard Mission brought a number of new technologies to the United States , including a cavity magnetron , a high @-@ powered device that generates microwaves using the interaction of a stream of electrons with a magnetic field . This device , which promised to revolutionize radar , demolished any thoughts the Americans had entertained about their technological leadership . Alfred Lee Loomis of the National Defense Research Committee established the Radiation Laboratory at the Massachusetts Institute of Technology to develop this radar technology . In October , Bainbridge became one of the first scientists to be recruited for the Radiation Laboratory by Ernest Lawrence . The scientists divided up the work between them ; Bainbridge drew pulse modulators . Working with the Navy , he helped develop high @-@ powered radars for warships . 

contradiction
 Konrad Zuse 's Z3 was the world 's first working programmable , fully automatic computer , with binary digital arithmetic logic , but it lacked the conditional branching of a Turing machine . On 12 May 1941 , it was successfully presented to an audience of scientists of the Deutsche Versuchsanstalt für Luftfahrt ( " German Laboratory for Aviation " ) in Berlin . The Z3 stored its program on an external tape , but it was electromechanical rather than electronic . The Colossus of 1943 was the first electronic computing device , but it was not a general @-@ purpose machine . 

contradiction
 Seizing upon a new development to visualize particle tracks , created by Donald Glaser and known as a bubble chamber , Alvarez realized the device was just what was needed , if only it could be made to function with liquid hydrogen . Hydrogen nuclei , which are protons , made the simplest and most desirable target for interactions with the particles produced by the Bevatron . He began a development program to build a series of small chambers , and championed the device to Ernest Lawrence . 
