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How To Calculate The Area Of A Right Cone

The cone is another three-dimensional shape based on the circle. You could think of it as the cross between a circle and a right triangle. Its properties will have features of both shapes, and this makes it easier to understand. One way to visualize a right cone is to think of it as a cylinder that tapers continuously to a point The area of a ...

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AreaOfARight Cone
Geology

Getting Burned By Acid Rain

If we measure the pH of distilled water, we will find that it is most often in the middle of the pH scale (7) - not too acidic, not too basic. Rainwater, without a lot of outside contaminants, tends ... Continue reading

AcidRain
Geology

Hurricanes, The Basics

There is nothing like them in the atmosphere. Born in warm tropical waters, these spiraling masses require a complex combination of atmospheric processes to grow, mature, and then die. They are not ... Continue reading

HurricanesTheBasics
Biology

Neurogenesis

Until recently, any doctor would have told you that when you lose brain cells, you can never replace them. Scientists now know that the human brain has the ability to regenerate brain cells, or ... Continue reading

Neurogenesis
Biology

Why Are Zebra Mussels Successful As Invaders?

The zebra mussel (Dreissena polymorpha) is a small, non-native mussel originally found in Russia. In 1988, this animal was transported to North America in the ballast water of a transatlantic ... Continue reading

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When Did A Cat Become A Kitty?

WhenDidACatBecomeAKittyIt has long been thought that cats were first domesticated in Egypt, about 4000 years ago. Indeed, they were very highly thought of in ancient Egyptian society. It was illegal to kill or harm them, and illegal to export them to other countries. When they died, they were often mummified in the same way as deceased human bodies. In fact, archaeologists working in Egypt have found more cat mummies than human mummies!

Unlike dogs, which are thought to have been domesticated by hunters, cats were domesticated by farmers. Stored grain attracted mice and rats to human settlements, and the ready supply of rodents attracted cats. People were glad to have the cats killing off the mice and rats, and gradually a friendly relationship developed. But in ancient Egypt cats were always free to come and go as they pleased!

New evidence recently published in Science suggests that cats were actually domesticated much earlier, over 9000 years ago, in Cyprus, not Egypt. Cyprus is an island at the eastern end of the Mediterranean Sea, near Turkey. Archaeologists working in Cyprus found a cat skeleton buried near that of a human. The skeleton is complete, showing that the cat was buried shortly after death. It appears to have been buried together with the human remains, perhaps because the dead person’s family regarded the cat as an important individual. Possibly the cat was killed so it could accompany its owner in the afterlife.