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Classifying Organisms

Have you ever noticed that when you see an insect or a bird, there is real satisfaction in giving it a name, and an uncomfortable uncertainty when you can't? Along these same lines, consider the bewildering number and variety of organisms that live, or have lived, on this earth. If we did not know what to call these organisms, how could we ...

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ClassifyingOrganisms
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

ZebraMusselsInvaders
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
Astronomy

The Strange Spin of Uranus

Directional terms like north and south make sense here on Earth. The north and south axis of the Earth is relatively perpendicular to the plane of the Earth's orbit around the sun. Actually, Earth's ... Continue reading

UranusSpin
Biology

The Blood-brain Barrier

In the human brain, there are approximately 400-425 miles of capillaries. Because the brain is basically a small neurochemistry factory, which makes our behavior a function of its interior chemical ... Continue reading

BloodBrain

Cloning and Ethics

CloningandEthicsCloning technology today is far from perfect: it requires many attempts and only 1%, if any, of the cloned eggs become embryos and then survive. For example, the first cloned sheep, Dolly, was successful after 277 attempts. That means that with the current technology, cloning a human being would require the death of many embryos - a moral issue not easy to deal with. Some say that embryos are not fully human, so there is no moral problem; others say it is obvious they are human, since all their genetic information is already present in the embryo.

The humanness of the embryo is not the only issue of debate in human cloning. Although there are good reasons to clone animals (for example, to preserve species and valuable genomes), are there any good reasons to clone a human? Defenders of human cloning say good reasons to clone a child would be to continue a family line when a couple is infertile (an adopted child would not carry their genes), to produce organs that are needed for transplants and trigger the development of new medical treatments. Critics of human cloning say it rises legal (if you have two humans with identical DNA, how do you determine guilt or innocence in criminal cases based on DNA evidence) and religious problems (cloning is considered by many religions as unnatural, evil, ‘not God’s way of reproduction’).

Bioethicists point out that the common fear about clones, that a clone of Hitler would be as bad as he was, is a myth without scientific basis, and we should weigh the risks of human cloning against its benefits. A good question is, if cloning becomes safe, should we do it?