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Earth's Magnetism

Most ancient civilizations were aware of the magnetic phenomenon. Sailors in the late thirteenth century used magnetized needles floating in water as primitive compasses to find their way on the sea. However, most believed that the magnetization of the Earth came from the heavens, from the so called celestial spheres which Greeks invented. It was ...

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EarthsMagnetism
Biology

Embryo Transfer and Cloning

Scientists use embryo transfer technology to obtain more offspring from a genetically superior animal. For instance, if a farmer owns a cow that produces excellent milk and wants more cows to produce ... Continue reading

EmbryoTransferandCloning
Medicine

When Motherhood Means More than One

These days, twins, triplets, and other multiple births are becoming more common, but how do they happen? Fraternal twins (or triplets, quadruplets, or more) develop when two or more eggs are ... Continue reading

MotherhoodMeansMoreOne
Biology

Why Do Leaves Change Color In The Fall?

Every fall the leaves of many trees turn magnificent colors. One of the great benefits of the season is looking at the fall foliage, with its bright reds, oranges and purples, before the leaves fall ... Continue reading

WhyDoLeavesChangeColorInTheFall
Physics

Many Happy Returns!

The boomerang is a bent or angular throwing club with the characteristics of a multi-winged airfoil. When properly launched, the boomerang returns to the thrower. Although the boomerang is often ... Continue reading

ManyHappyReturns

Smallpox, Chickenpox . . . Monkeypox?

SmallpoxChickenpoxMonkeypoxThis past summer a few people in the midwest came down with monkeypox, a viral disease related to smallpox but less infectious and a lot less deadly to humans. Oddly they all seem to have caught the disease from domesticated prairie dogs, which have become increasingly popular as pets. Like chickenpox, monkeypox causes fever, swollen lymph nodes, and a rash. Like smallpox and chickenpox, the spots can leave scars. Most people recover from monkeypox, but it is occasionally deadly.

Monkeypox is not usually found in North America. It is normally found in the rainforests of Africa, where it infects squirrels, rodents (and of course monkeys). It is assumed that the Wisconsin prairie dogs caught it at the pet store from exotic pets imported from Africa, possibly giant gambian rats (yes, some people consider these pets).

To prevent the virus from entering the wild rodent population in this country, the Centers for Disease Control banned the importation of rodents from Africa and set out strict guidelines for handling and quarantining suspected cases in pets. By the end of July there had been 37 confirmed monkeypox cases in humans, but there have been no more cases in this country since then.