How Do We Grip?
How Do We Grip? We take a grip on things by using our muscles to exploit the development of the human thumb. The importance of this thumb is that it can be moved across...
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Who Uses a Cardiac Pacemaker?
Who Uses a Cardiac Pacemaker? Cardiac pacemakers are used by sufferers from “bradycardia” and “heart-block”. Bradycardia is a heartbeat that is slower than normal....
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Why Do Doctors Take Your Temperature?
Why Do Doctors Take Your Temperature? The body temperature of a human being is an indication of his physical condition, so that an abnormally high or low temperature is...
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When Was the Thermometer Invented?
When Was the Thermometer Invented? The first practical thermometer or instrument for measuring temperature was invented shortly before the end of the 16th Century by...
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What Does an X-ray Show?
What Does an X-ray Show? X-rays are electromagnetic rays of very short wavelength which can penetrate matter through which light rays cannot pass. We call this opaque...
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When Was Penicillin Discovered?
When Was Penicillin Discovered? Penicillin was discovered in 1929 by Sir Alexander Fleming, then a professor and lecturer at the Royal College of Surgeons in London. He...
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What Is the Coccyx?
What Is the Coccyx? The coccyx, commonly referred to as the tailbone, is the lower end of the spinal column of man and consists of four nodules of bone, like tiny...
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How Do Certain Drugs Put Us to Sleep?
How Do Certain Drugs Put Us to Sleep? Some drugs, called hypnotics, put us to sleep by producing a depressive or slowing-down effect on our central nervous system. They...
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Why Does Skin Color Vary?
Why Does Skin Color Vary? People vary in the color of their skin because of a network of pigment-forming cells called melancoytes. This network is interspersed between,...
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Why Do Leopards Have Rosette Shaped Markings but Tigers Have Stripes?
Why Do Leopards Have Rosette Shaped Markings but Tigers Have Stripes? Rudyard Kipling suggested that it was because the leopard moved to an environment “full of...
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