When Motherhood Means More than One
These days, twins, triplets, and other multiple births are becoming more common, but how do they happen? Fraternal twins (or triplets, quadruplets, or more) develop when two or more eggs are fertilized by two or more sperm. This can happen when the ovaries…
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Geology
The Hole Scoop on Ozone
Ozone is a molecule containing three oxygen atoms. It is blue in color and has a strong odor. Normal oxygen,…
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How Sublime
Show of hands. How many of you can't resist playing with dry ice? Dry ice is carbon dioxide frozen to -109.3…
Engineering
Hydropower Basics
Flowing water creates energy that can be captured and turned into electricity. This is called hydropower.…
Geology
Distant Mountains Influence River Levels 50 Years Later
Rainfall in the mountains has a major influence on nearby river levels, and its effects can be seen as much as…