eyes

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6 09, 2017

Human organs: medieval science

By |2019-09-15T21:13:36-07:00September 6th, 2017|Biology, Science|0 Comments

Chinese drawing of the human organs (about 1200) Eyes and fevers Between the Middle Ages and modern times, doctors have learned a lot of new things about how human bodies work. Earlier history of the human body History of medicine History of science All our biology articles The Islamic doctor al-Tabari, in the early 800s, [...]

4 09, 2017

Ptolemy – Roman astronomy – history of science

By |2018-04-11T09:22:19-07:00September 4th, 2017|Romans, Science|0 Comments

A copy of Ptolemy's map of the world Ptolemy was born in Egypt in about 90 AD, when the Romans were ruling Egypt. He was a Roman citizen. Probably he was the son or grandson of a Roman government slave - maybe a clerk - who was freed and got citizenship. As a boy, Ptolemy went to Greek schools in Alexandria and wrote in Greek. When [...]

4 09, 2017

Medicine and doctors in the Roman Empire

By |2019-07-15T22:20:43-07:00September 4th, 2017|Romans, Science|1 Comment

Roman medicine: Galen used surgical instruments like these What do we mean by Roman medicine? Roman medicine is really West Asian and African medicine. That's because most of the great doctors of the Roman Empire lived in West Asia (in Turkey and Syria), or in Africa (in Egypt), not in Europe. Egyptian doctors [...]

20 08, 2017

Why is the sky blue? Weather science

By |2017-08-20T23:42:12-07:00August 20th, 2017|Physics|0 Comments

Blue sky with cirrus clouds This is an easy question to ask but the answer is pretty hard. The light that comes from the Sun to Earth looks white, but really it is made up of all different colors of light mixed together. You can see this by using a glass of water or a glass prism to break up [...]

16 08, 2017

What is a light-year? Physics definitions

By |2018-05-31T11:49:14-07:00August 16th, 2017|Physics|0 Comments

Light takes years to reach us from these stars far away in space. A light-year is the distance that light can travel in one year - that is, in the time it takes the planet Earth to make one full trip around the Sun. Light travels 186,000 miles in a second, so in [...]

6 08, 2017

David Hume – European philosophy

By |2019-09-04T10:40:27-07:00August 6th, 2017|Modern Europe, Philosophy|0 Comments

David Hume, the European philosopher Who was David Hume? Soon after Hobbes and Locke died, starting in 1739 AD, David Hume published more important books about philosophy. Hume disagreed with Descartes' idea that people did what their reason or logic told them was best. Thomas Hobbes John Locke René Descartes The Enlightenment All our modern Europe articles Hume thought [...]

4 08, 2017

Roger Bacon – Medieval science

By |2018-04-24T08:21:21-07:00August 4th, 2017|Medieval, Science|0 Comments

Roger Bacon's diagram of a human eye Roger Bacon was born in England maybe about 1210 AD. It was late in the reign of King John. (That's the one in Robin Hood.) England was just beginning to get richer from raising and selling high quality wool cloth on the Silk Road. In addition, a warmer climate - the Medieval Warm period - was making [...]

4 08, 2017

Francis of Assisi – Medieval Europe

By |2018-10-02T06:59:07-07:00August 4th, 2017|Medieval, Religion|0 Comments

Francis of Assisi gives his father back his clothes (Giotto, in Assisi) Who was Francis of Assisi? By 1200 AD, the Catholic Church was very powerful. Bishops and popes were often rich men. They cared more about getting rich collecting tithes than they did about praying or helping poor people. What is a bishop? What is the pope? History of [...]

27 07, 2017

Medieval Islamic medicine

By |2019-08-22T09:31:55-07:00July 27th, 2017|Islam, Science|0 Comments

Islamic medicine: From an Ottoman manuscript, two doctors telling the pharmacist how to make different medicines Writing medical encyclopedias Doctors made big scientific advances in medicine during the Islamic empire. The Islamic Empire was rich enough from Silk Road trade and trading on the Indian Ocean to pay a lot of doctors and scientists, [...]

27 07, 2017

Medieval Islamic science

By |2019-10-07T07:26:55-07:00July 27th, 2017|Islam|0 Comments

Medieval Islamic science: Al Tusi's diagram of linear motion from circular motion Indian and African science In the Early Middle Ages, before the formation of the Islamic Empire, Buddhists ran the world's biggest universities. One was in India, at Nalanda. Another was in what is now Pakistan, at Taxila. Medieval Islamic science built on this Indian scientific tradition. [...]