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Dysentery – History of diarrhea

By | 2017-09-06T17:52:46+00:00 September 6th, 2017|Greeks, Science|

A waterfall in what is now the south-eastern United States Dysentery means having trouble with your insides - your intestines. It usually means that you have very serious diarrhea. In the ancient and medieval world, dysentery killed about a third of all the babies born before they got to be a year old. [...]

What is cholera? History of disease and medicine

By | 2017-09-06T17:31:15+00:00 September 6th, 2017|Biology, Science|

Washing clothes in the river (India) Cholera (KOLL-uh-rah) is a very serious sickness. It probably first got started in India. People in India were dying of cholera by the time of Chandragupta, about 300 BC, and maybe earlier. Cholera epidemics in India usually got started during monsoons. During the monsoon, warm rain fell and raised the water [...]

Why does it rain? Weather – Earth science

By | 2017-08-20T18:07:53+00:00 August 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+00:00 June 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 | 2018-04-19T09:26:55+00:00 June 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 | 2017-05-29T00:45:28+00:00 May 29th, 2017|Biology|

A prokaryote (seen through a microscope) 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. The first prokaryotes probably evolved from even simpler cells about 3.5 billion years ago. For at least a billion [...]

What are E. coli bacteria? Cell biology

By | 2017-05-28T22:11:41+00:00 May 28th, 2017|Biology|

E. coli bacterium under a microscope E. coli are a very common kind of prokaryote cell that lives mainly inside mammals and birds, including inside you. They can only live for a short time on their own, because they have evolved over time to live inside animals. E. coli live in your intestines, [...]