The Law of DetachmentGeometryTaking the Burden out of ProofsThe Law of DetachmentThe Importance of Being DirectProof by Contradiction: The Advantage of Being IndirectThe Given Information: Use It or…
Born: Dec. 3, 1965East German figure skater 4-time world champion (1984-85,87-88); won consecutive Olympic gold medals (1984,88). See also: Memorable Moments: Katarina Witt.
Born: June 19, 1967Norwegian cross-country skier winner of a record eight gold and 12 overall Winter Olympic medals from 1992-98. See also: Bjorn Daehlie: The winningest Winter Olympian.
ChemistryAdvanced-Level Science ProjectsChemistryWhat's in a Color?Copper Magic Which Metal Corrodes the Fastest? Did you ever have a shiny new bike that over time got to look not so shiny and…
—Francis Scott Key, 1814O say, can you see, by the dawn's early light,What so proudly we hail'd at the twilight's last gleaming?Whose broad stripes and bright stars, thro' the perilous fight,O'er…
Looking north over Biscayne Bay at an island (at left) and at mangroves that line the shoreline (at back).Yosemite and Yellowstone are the jewels of our national park system. But you can find plenty…
