ScienceIQ.com

Palm Trees and Prickly Pears

If you drive around Southern California you'll see a lot of palm trees and prickly pear cacti. If you drive around Southern Spain you will too! How did it happen that two places an ocean apart have the same desert plants? The Prickly Pear Cactus, known to scientists as 'Opuntia', is native to the American Southwest and Mexico. In Mexico they are ...

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PalmTreesandPricklyPears
Biology

Wetlands Top Ecosystem

Wetlands are areas where water covers the soil, or is present either at or near the surface of the soil all year or for varying periods of time during the year, including during the growing season. ... Continue reading

Wetlands
Chemistry

When Chlorine Met Sodium...

Sodium is a required element in human physiology. The eleventh element in the periodic table, sodium is a soft, silvery white metal that can be easily cut through with a paring knife. It is highly ... Continue reading

WhenChlorineMetSodium
Biology

Ergot, Witches & Rye. Oh My!

Did you know that a disease of rye is connected to LSD and witches? Ergot is caused by a fungus that attacks a number of cereal grains, but rye is most severely infected. The healthy grains are ... Continue reading

ErgotWitchesRyeOhMy
Chemistry

How Sublime

Show of hands. How many of you can't resist playing with dry ice? Dry ice is carbon dioxide frozen to -109.3 degrees F (-78.5 C). Throw a piece in water and it bubbles and boils. Expose a piece to air ... Continue reading

DryIce

Mother Nature's Own Brand of Bioterror

BioterrorWe've been hearing a lot about smallpox lately, as a possible bioterror attack. But Mother Nature has her own brand of bioterror. Smallpox has been with us for about ten thousand years, since the earliest agricultural settlements in Africa. From there it spread to Egypt and on into Europe and Asia. Smallpox victims have a high fever, ache all over, and get a terrible rash that usually leaves disfiguring scars. Often the rash spreads to the eyes, leading to blindness. As many as half of the victims die.

Pharoah Ramses V of Egypt appears to have died of smallpox, as his well-preserved mummy shows the characteristic scarring. The Greek historian Thucydides noted that people who survived smallpox were later immune to it (but the Greeks did not invent vaccination). Epidemics of smallpox hastened the decline of the Roman empire.

But the most catastrophic smallpox epidemics befell the natives of the New World, for smallpox had not reached the Western Hermisphere until the Europeans brought it in the 15th century. The native americans, having no experience with it, had no resistance and died by the thousands. Since none of them had ever had it before, nobody was immune, and everybody in the community got sick. It is thought that as many as 90% of the native american population died of European diseases, including smallpox.