What Are Stem Cells?
When an egg is fertilized by a sperm cell, it quickly becomes a single cell from which all cells of the body-to-be will be created. This 'mother of all cells' is what biologists call a totipotent stem cell, meaning that it has unlimited creative power. Within…
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Geology
What Is The Most Damaging Hazard From A Hurricane?
The greatest potential for loss of life and property related to a hurricane is from the storm surge—water…
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X-Ray Astronomy vs. Medical X-Rays
It's natural to associate the X-rays from cosmic objects with an X-ray from the doctor's office, but the…
Medicine
Re-emerging Microbes
The reappearance of microbes that had been successfully conquered or controlled by medicines is distressing to…
Medicine
What Is a Bruise?
A bruise is a deposit of blood under the skin. It flows from tiny capillaries that break when you bump your…