Word: ageing
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Dates: during 1990-1999
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...internal motions under the ocean floor. Suddenly, Wegener's disreputable ideas became reputable. Renamed plate tectonics, they gave geology a single unifying theory, explaining everything from earthquakes and volcanoes to the formation of mountain ranges and ocean basins. Sadly, Wegener, who perished on the Greenland icecap in 1930 at age 50, didn't live...
...were true, so he didn't bother to prove them. That wouldn't do. Hardy brought him to England in 1914, and the pair spent four years working to prove the self-taught mathematician's intuitively brilliant conjectures. Alas, Ramanujan hated England and died of tuberculosis in 1920 at age 32--with so much of his opus left unproved that mathematicians today are still working...
Science fiction is a native 20th century art form that came of age at the same time as jazz. Like jazz, science fiction is very street-level, very American, rather sleazy, rather popular, with a long and somewhat recondite tradition. It's also impossible to avoid, no matter how hard...
...French boys searching for their dog stumble onto the Lascaux cave, whose walls are covered with spectacular paintings and engravings dating from the Ice Age...
...American anthropologist Margaret Mead publishes Coming of Age in Samoa...