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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 milk like hers, he can use embryo transfer. How? A scientist collects an embryo (a fertilized ovum) from the cow (called ‘the donor’) and transfers it ...

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EmbryoTransferandCloning
Biology

Giant Cloned Monster Loose In Mediterranean Sea

Native Caulerpa taxifolia is found in and around the waters of Florida and the Caribbean. It is a smallish, yet hardy saltwater plant that grows rapidly and is ideal for use in aquariums with diverse ... Continue reading

Caulerpa
Biology

Potassium Iodide To The Rescue

Since the end of the Cold War, the focus of the nuclear threat has changed from hostile countries to terrorist cells. What should we do if terrorists set off a dirty bomb in a populated area, or ... Continue reading

PotassiumIodide
Geology

CALIPSO in 2004

From reports of increasing temperatures, thinning mountain glaciers and rising sea level, scientists know that Earth's climate is changing. But the processes behind these changes are not as clear. Two ... Continue reading

CALIPSOin2004
Mathematics

Kepler's Conjecture

Take a bunch of oranges that are similar in size and try to pack them into a cardboard box. What is the most efficient orange arrangement so that you fit the most oranges into the box? Should you ... Continue reading

KeplersConjecture

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.