(Encyclopedia) Kirkwood gaps, regions in the asteroid belt within which few asteroids are found. Astronomer Daniel Kirkwood first observed (1886) that few asteroids had an orbital period close to 1…
(Encyclopedia) Block, Adriaen, fl. 1610–24, Dutch navigator. Eager to establish a fur trade with the Native Americans, Amsterdam merchants sent (1613) Block and another Dutch navigator to explore the…
Source: U.S. Dept. of the Interior, Geological Survey According to the theory of continental drift, the world was made up of a single continent through most of geologic time. That continent…
The Breaking of the BellsAmerican Telephone and Telegraph (AT&T) was the target of a suit filed under the Sherman Antitrust Act and faced charges of operating a nationwide monopoly on…
Some Native Americans have two names, one of which is never made public because of the power it would give another person over them.It is common in parts of West Africa for people to name their…
Sources: NASA and the International Astronomical Union. News Flash (August 24, 2006)—Pluto Demoted! Read About It Here. Misleading reports that Pluto was about to lose its status as a planet in…
Colloids: Somewhere in BetweenChemistryElements, Compounds, and MixturesPure SubstancesShake It Up: MixturesColloids: Somewhere in BetweenSeparating Mixtures Earlier, I said that something was…
Speed and Distance Problems
Algebra
Whipping Word Problems Interest Problems Area and Volume Problems Speed and Distance Problems Mixture and Combination Problems
Have you ever heard of a…
The Bombings of Hiroshima and Nagasaki August 6 and 9, 1945 by Ben Snowden At 2:45 in the morning of August 6, 1945, an American B-29 bomber flew north from Tinian Island in the Marianas…
What is this job like? Very athletic people might want to consider getting a job as a "pro" athlete. But they should know that very few athletes ever make it that far. It's a good idea, then, to…
