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Let Go, Gecko!

Geckos are small, insect-eating, noisy lizards that live in many parts of the world. While geckos have become common pets, the way that they manage to stick to smooth ceilings has remained a mystery. Scientists initially expected to find that geckos have tiny suction cups on their feet, or a sticky glue secreted by their toes. Both explanations ...

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Geckos
Geology

Pyroclastic Flows: Deadly Rivers of Rock

A volcano, during a violent eruption, blasts massive amounts of heated rock fragments, hot gas and ash out vents and collapsing domes. This sudden outpouring of superheated material reaches ... Continue reading

VolcanoFlows
Biology

The Human Pancreas

The pancreas is a body organ that does some heavy lifting. It carries on two important functions relating to digestion and the regulation of blood sugar. The exocrine, the larger function, makes ... Continue reading

HumanPancreas
Chemistry

Take Two And Call Me In The Morning

Aspirin has been used for hundreds of years to relieve pain and reduce inflammation. It belongs to a group of chemicals called salicylates and was originally derived from the bark of the willow tree. ... Continue reading

Aspirin
Geology

Rock, Mineral, Crystal, or Gemstone?

Rocks and minerals are all around us and used every day, perhaps without us even being aware of them. Besides making up the solid, supporting surface of the earth we live and move upon daily, rocks ... Continue reading

RockMineralCrystalGemstone

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.