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27 November 2013 12:59 pm ,
Vol. 342 ,
The new head of the National Center for Science Education promises to "fight the good fight" against attacks on...
Analyses of the H7N9 strains isolated from four new cases show that the virus is evolving rapidly, heightening anxiety...
In 2009, Jack Szostak shared a Nobel Prize for his part in discovering the role of telomeres, the end bits of...
Science has exposed a thriving academic black market in China involving shady agencies, corrupt scientists, and...
Paper-selling agencies flourish in the aura of reputable businesses. For some scientists, it may be difficult to tell...
Featuring the first lunar rover in 40 years, Chang'e-3 is seen as an important milestone on China's quest to send a...
Data collected by satellites and floating probes have chronicled a 2-decade rise in the temperature and thickness of a...
Cholesterol, the artery-clogging molecule that contributes to cardiovascular disease, has another nasty trick up its...
- 27 November 2013 12:59 pm , Vol. 342 , #6162
- About Us
23 March 1998 7:00 pm
Yesterday was the birthday of Robert Millikan (born in 1868), the physicist who first measured the charge of an electron--an experiment repeated every year by physics students around the world. In 1908, physicists were struggling to measure the electron's charge with clouds of water droplets. By placing a charge on the droplets, they could tug the droplets upward against gravity with an electric field. Once the droplets were hovering in midair, their mass and the strength of the electric field would reveal the charge of the electron. But evaporation was foiling the measurements, so Millikan substituted oil droplets. His experiment succeeded, and Millikan proved that the electron was indeed an elementary particle with a fundamental charge. He published his value for the charge of an electron in 1913 and 10 years later received the Nobel Prize in physics.
[Source: Emily McMurray, Ed., Notable Twentieth Century Scientists (Gale Research Inc., ITP, 1995).]