ScienceIQ.com

Why Is Blood Pressure Two Numbers?

Blood pressure might better be called heart pressure, for the heart's pumping action creates it. To measure blood pressure, health workers determine how hard the blood is pushing at two different times: when the heart contracts, called systole; and when the heart relaxes, called diastole. The contraction of the ventricles during systole gives the ...

Continue reading...

WhyIsBloodPressureTwoNumbers
Biology

Do Blind People Dream?

Dreams are a universal feature of the human mind. Carl Jung even believed that visions in our dreams offer glimpses into universal archetypes, instinctive primordial images deriving from a collective ... Continue reading

DoBlindPeopleDream
Astronomy

Microbes In Space

There are creatures that were living on the Space Station before the first astronauts went inside. Astronauts found a few living on the Moon. Scientists believe they could even live on Mars. These ... Continue reading

MicrobesInSpace
Engineering

How Can A Bullet-proof Vest Stop A Bullet?

Here's an experiment: take the small coil springs from a dozen or so retractable pens and roll them together in a heap until they are thoroughly tangled and entwined. Now try to pull them apart from ... Continue reading

BulletproofVestStopABullet
Medicine

The Plague

Plague is an infectious disease caused by the bacterium Yersinia pestis. The bacterium is found mainly in rodents, particularly rats, and in the fleas that feed on them. Other animals and humans ... Continue reading

ThePlague

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?