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What is Dysentery? – History of diarrhea

By |2019-05-19T07:14:33-07:00September 6th, 2017|Greeks, Science|

History of Dysentery: Dysentery came from germs in your drinking water. Here people are washing clothes in the river (India) What is dysentery? Dysentery means having trouble with your insides - your intestines. You might say you had a tummy-ache. It usually means that you have very serious diarrhea. What germs cause dysentery? [...]

What is cholera? History of disease and medicine

By |2019-04-01T05:55:51-07:00September 6th, 2017|Biology, Science|

History of cholera: Washing clothes in the river (India) Where did cholera get started? Cholera (KOLL-uh-rah) is a very serious sickness. It probably first got started in India. History of disease Indian doctors and medicine All our India articles When did cholera first make people sick? People in India were dying of cholera by [...]

Why does it rain? Weather – Earth science

By |2017-08-20T18:07:53-07:00August 20th, 2017|Physics|

Thanks to Rocbike for the great picture! When the Earth first formed, about 4.5 billion years ago, it didn't rain here. Until about four billion years ago, Earth was too hot for raindrops to form, and water just hung in the air as steam without falling as rain. Then as the Earth's surface began to cool, in the Archaean era, huge clouds formed and began [...]

What is a wet nurse? History of wetnursing

By |2018-05-08T08:36:59-07:00June 12th, 2017|Economy|

What is a wet nurse? An ancient Egyptian wet nurse nursing a baby (From the tomb of one of the daughters of Akhenaten) What is a wet nurse? A wet nurse is a woman who breast-feeds somebody else's baby, either for money or because she is enslaved. From the Stone Age up until the [...]

History of Cheese – Central Asia

By |2019-03-21T05:55:42-07:00June 12th, 2017|Central Asia, Food|

History of cheese: There are lots of different kinds of cheese. How to preserve milk? If you don't have a refrigerator, there's no way to keep milk from going bad within a few hours. Even WITH a refrigerator milk goes bad in about a week. But ancient cows and sheep and goats only [...]

What is a prokaryote – Cell biology

By |2018-09-11T05:51:18-07:00May 29th, 2017|Biology|

A prokaryote (seen through a microscope) What does "prokaryote" mean? The simplest living cells are called prokaryotes, which is Greek for "before the nucleus" - these are cells that were so simple that they didn't have a nucleus. When did the first prokaryotes evolve? The first prokaryotes probably evolved from even simpler cells [...]

What are E. coli bacteria? Cell biology

By |2019-05-19T07:36:49-07:00May 28th, 2017|Biology|

E. coli bacterium under a microscope Where do E. coli bacteria live? E. coli are a very common kind of prokaryote cell that lives mainly inside mammals and birds, including inside you. What are prokaryotes? What is dysentery? All our biology articles What do E. coli bacteria do? They can only live for [...]