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13 March 2014 11:08 am ,
Vol. 343 ,
In the shadow of the crisis in Crimea, Ukrainian legislators are weighing a pair of science and education bills that...
Researchers dependent on government funding would face a flat future under the White House's $3.9 trillion budget...
Reservoirs of cells that harbor HIV DNA woven into human chromosomes have become the bane of researchers trying to cure...
Geochemists have now incorporated in their models some details of the way naturally acidic rainwater dissolves rock...
Schizophrenia is a devastating mental disorder that afflicts about 1% of the world's population at one time or another...
Surface tension is a force to be reckoned with, especially if you are small. It enables a water strider to skate along...
- 13 March 2014 11:08 am , Vol. 343 , #6176
- About Us
Discoveries by Induction
26 February 1999 6:45 pm
is the birthday of Dominique François Jean Arago, a French astronomer and physicist born in 1786. Arago is best known for his discovery of the chromosphere--the sun's lower atmosphere--which is composed primarily of hydrogen gas, and for his accurate estimates of the diameters of the planets. In physics, Arago found that a rotating copper disk deflects a magnetic needle held above it, a phenomenon later explained in terms of magnetic induction. He also showed that light waves move more slowly through a dense medium than through air. Arago entered politics in 1848 as Minister of War and Marine and was responsible for abolishing slavery in the French colonies.
[Source: Trevor I. Williams, Ed., A Biographical Dictionary of Scientists (John Wiley & Sons, ed. 3, New York, 1982).]