(Encyclopedia) International Geophysical Year (IGY), 18-month period from July, 1957, through Dec., 1958, during a period of maximum sunspot activity, designated for cooperative study of the solar-…
(Encyclopedia) silicate, chemical compound containing silicon, oxygen, and one or more metals, e.g., aluminum, barium, beryllium, calcium, iron, magnesium, manganese, potassium, sodium, or zirconium…
(Encyclopedia) bariumbariumbârˈēəm [key] [Gr.,=heavy], metallic chemical element; symbol Ba; at. no. 56; at. wt. 137.327; m.p. 725℃; b.p. 1,640℃; sp. gr. 3.5 at 20℃; valence +2. Barium is a soft,…
(Encyclopedia) technetiumtechnetiumtĕknēˈshēəm [key] [Gr. technetos=artificial], artificially produced radioactive chemical element; symbol Tc; at. no. 43; mass no. of most stable isotope 98; m.p. 2,…
Sources: NASA and Harvard-Smithsonian Center for Astrophysics. NASA's most powerful X-ray telescope, called the Chandra X-ray Observatory (CXO), was launched from the space shuttle Columbia…
Ray was the unwitting patsy for someone shadier by Borgna Brunner Was James Earl Ray, a career criminal and known racist, nothing more than a patsy for someone even shadier? King Conspiracy…
(Encyclopedia) cobalt, metallic chemical element; symbol Co; at. no. 27; at. wt. 58.9332; m.p. 1,495℃; b.p. about 2,870℃; sp. gr. 8.9 at 20℃; valence +2 or +3. Cobalt is a silver-white, lustrous,…
(Encyclopedia) rainbow, arc showing the colors of the spectrum, violet inside and red outside, which appears when the sun shines through water droplets. It often appears while the sun is shining…
By choosing a lifestyle that avoids certain risks, you can help protect yourself from developing cancer. Many cancers are linked to factors that you can control. Tobacco. Smoking and using…
