When

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Colonization timeline – 1500 AD to modern times

By |2019-04-17T09:40:38-07:00September 10th, 2017|Africa, History, When|

Tenochtitlan under attack (painted in the 1600s) Ships and sailing improve Beginning about 1450 AD, Europeans took advantage of new advances in sail technolog. They invaded and took over most of the world beyond Europe. Their colonization had disastrous effects for the people they conquered. Medieval ships and sailing Europe in the 1500s All our [...]

Late Middle Ages timeline – 1100-1500 AD

By |2018-04-09T10:31:17-07:00September 10th, 2017|Central Asia, History, When|

The Mongol court (1200s AD) After the warming trend of 1000 AD came a colder period around 1300 AD called the Little Ice Age. Again, people felt the effects around the world. In Central Asia, the Mongols rose to power in the late 1200s AD. They conquered China, Russia, northern India, and most of the Islamic Empire and united them into one huge [...]

Early medieval world history timeline: 400-800 AD

By |2019-05-19T21:05:14-07:00September 10th, 2017|History, Islam, When|

Early medieval timeline: Dome of the Rock mosque, Jerusalem (600s AD)  Europe in the Early Middle Ages In the Early Middle Ages, many empires around the world collapsed into smaller countries. Partly because of the Huns invading, the western half of the Roman Empire collapsed. Who were the Huns? The Fall of Rome More about [...]

World history timeline: from Jesus to 400 AD

By |2017-10-14T14:56:41-07:00September 10th, 2017|History, Romans, When|

Roman amphitheater (El Jem, Tunisia) The great empires formed during the last years before Christ continued peacefully through much of this period. In India, the Mauryan Empire collapsed. There was a period of smaller kingdoms. But by 319 AD northern India reunited under the Guptan Empire. In China, the Han Dynasty lasted until 220 AD, but then fell apart [...]

Empires timeline – 500 BC to Jesus

By |2018-04-09T10:31:17-07:00September 10th, 2017|History, Romans, When|

Achilles bandaging the wounded Achilles binding up the wounds of Patroclos (Athens, red-figure vase, 500 BC -now in Berlin) All over the world, the time between 500 BC and 1 BC was a time of unification. People traded with each other. And they built big empires. Cyrus the Great's unification of the Persian Empire brought peace and stability [...]

Ancient history timeline: 10,000-4000 BC – the Stone Age

By |2018-04-19T15:03:06-07:00September 10th, 2017|History, West Asia, When|

Ancient history timeline: Building at Gobekli Tepe in what is now  Turkey (ca. 9000 BC) Beginning of farming Around 10,000 BC, with the end of the last major Ice Age, people all over the world - not everyone, but a lot of people - began to shift from fishing and hunting and gathering to farming as their main way of getting food. Farming [...]

What is Time? – Time and space in Physics

By |2018-05-31T11:49:26-07:00August 19th, 2017|Physics, When|

Time and space: a sundial from Ukraine (ca. 1300 BC) - one of the two oldest sundials in the world Are time and space the same thing? Nobody knows what time is, or how it works. Time seems to be closely related to space, and it's possible that space and time are different ways [...]

Big bang – Space science – Physics

By |2019-02-13T20:55:59-07:00August 17th, 2017|Physics, When|

Inside stars (like our Sun) there are fusion reactions. Stars got started after the Big Bang. What was the Big Bang? The Big Bang was the very beginning of our Universe, and it probably happened about 13.73 billion years ago, because that's how old the oldest stars are, and we think that stars began to form almost immediately [...]

Jurassic Period – dinosaurs and ferns

By |2018-04-21T11:56:46-07:00June 24th, 2017|Geology, When|

A dinosaur skeleton When the Jurassic period began, about 199 million years ago, a lot of animals had just become extinct in the catastrophe that ended the Triassic period. This left room for the dinosaurs to have a lot of baby dinosaurs. Soon all different kinds of dinosaurs were living all over the [...]