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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.

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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

DNA-based migration routes of Homo sapiens DNA-based migration routes of Homo sapiens
Concept of Birth by Children Concept of Birth by Children
Vocational interests seem to be established well before adulthood, and young people of all ages ... Vocational interests seem to be established well before adulthood, and young people of all ages ...
In early capitalism, children worked alongside adults. At that time, just as today, most street ... In early capitalism, children worked alongside adults. At that time, just as today, most street ...
Increase in Obesity among U.S. Children and Adolescents Increase in Obesity among U.S. Children and Adolescents
Water-based Diseases Water-based Diseases
Video: Stroke volume - contractility definition

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