Science

/Science

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? [...]

Ancient diseases and doctors – History of medicine

By |2019-05-13T10:53:35-07:00September 6th, 2017|Egypt, Science|

Greek doctor letting blood out of a patient because he believes in the four humors: history of medicine How did ancient doctors treat diseases? Ancient doctors tried to cure everyone who was sick, but they did better with some diseases than with others. The history of medicine is full of mistakes as well as [...]

What is dengue fever? History of disease and medicine

By |2018-04-25T10:34:33-07:00September 6th, 2017|Science|

Dengue history: the dengue virus - magnified many times Dengue history Probably dengue fever didn't exist before the late 1700s AD, so in the ancient and medieval worlds there was no dengue fever. Most people think that the virus that causes dengue evolved from some earlier virus that didn't make people sick. Dengue appeared all over [...]

What is cholera? History of disease and medicine

By |2019-04-01T05:55:51-07:00September 6th, 2017|Biology - Evolution, from cells to modern mammals, birds, and reptiles, 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 [...]

Logic and the scientific method

By |2018-05-31T11:49:22-07:00September 6th, 2017|Science|

An eclipse of the moon. You can see the curved shadow of the Earth. Once people have seen that something happens through observation, sooner or later it will occur to them to ask why it happens. And is there any way to prove that it will happen the same way every time? Sumerians developed advanced math to [...]

What is lead? A heavy kind of metal

By |2018-04-11T18:24:13-07:00September 6th, 2017|Religion, Romans, Science|

A Roman anchor from Palermo, Italy Lead is a kind of metal that is very heavy. (See if you can get some lead, like a fishing weight, to see how heavy it is). People have been mining lead and using it for weights in West Asia since about 4000 BC, about the same time people started to use copper, and before [...]

Ancient and medieval science

By |2018-04-25T10:30:30-07:00September 6th, 2017|History, Science|

Chinese star chart possibly dating from the 600s AD, during the T'ang Dynasty Science means "knowing" in Latin. It is the process of learning things about the world. People have always wanted to learn more about their world, and they have tried a lot of different ways to find things out. Some of the ways they tried [...]

Medieval stained glass, eyeglasses, and modern glass

By |2019-04-16T13:03:48-07:00September 5th, 2017|Medieval, Modern, Science|

Medieval glass: Islamic glass (probably Iraq, 800s AD, now in the Metropolitan Museum, New York) Medieval glass-making By the 1100s, glass-making was expanding again from West Asia; there were glassworks further east at Kuva in Central Asia (modern Uzbekistan). Who invented glass? Blowing glass Islamic science Medieval European science  All our medieval Europe articles Venice and [...]

History of glass – Who invented glass?

By |2019-07-07T10:37:45-07:00September 5th, 2017|Ancient, Science, West Asia|

Obsidian: naturally occurring glass History of glass: Glass beads from Old Kingdom Egypt, about 2700-2500 BC People have been using naturally occurring glass since the Stone Age, when they wanted an especially sharp edge on a tool or an arrowhead. What is obsidian? Egyptian science African science All our ancient Egypt articles All Africa [...]