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Who built Great Zimbabwe? Central African history

By |2018-04-13T01:39:20+00:00October 2nd, 2017|Africa, History|

Central Africa in the Middle Ages: Great Zimbabwe Iron comes to Central Africa Besides South Africa, central Africa is the most isolated part of Africa - for many years, the people who lived here saw almost nobody from outside their own area. So it took longer for people in Central Africa to find out [...]

Electromagnets – electricity and magnets

By |2018-05-31T11:49:20+00:00August 16th, 2017|History|

An electromagnet from inside a stereo speaker In the early 1800s AD, about 200 years ago, scientists in Denmark and Britain figured out another way to make magnets. This way you didn't need a lodestone. You could also make much stronger magnets. And you could turn the magnets on and off. The new way [...]

Electromagnet project – Electricity – Science

By |2018-05-31T11:49:13+00:00August 16th, 2017|Physics|

Build your own electromagnet with a nail, some copper wire, and a battery You can build your own electromagnet. Get about five meters of copper magnet wire (you can buy it at Radio Shack or Home Depot), a large iron nail or another piece of iron about the same size like a butter knife, a rubberband, some sandpaper, [...]

Mississippi People – Native Americans

By |2018-04-07T17:05:36+00:00August 9th, 2017|History, Native American|

A Mississippian warrior About 800 AD, the old Hopewell people seem to have developed what we call the Mississippian culture. People living near the Mississippi river got new kinds of corn about this time. Now, instead of just building burial mounds, people built mounds with flat tops and built buildings on top of the mounds, like a Mayan temple. Some [...]

Spices and cotton: Mughal Indian economy

By |2018-04-23T14:30:47+00:00July 19th, 2017|Economy, India|

Japanese painting of Portuguese bringing Indian cargo to Japan (1500s AD) Under the Mughal Empire, India continued to make a lot of money by trading things back and forth between East Africa and West Asia to their west, and South-East Asia and China to their east. Mostly Indian traders sold medicine and  pepper and cinnamon and other spices to West Asia. They sold glass beads and cotton cloth to [...]

Tang Dynasty Chinese Pottery – Medieval China

By |2018-08-08T07:11:45+00:00June 6th, 2017|Art, China|

T'ang Dynasty cup (Musee Guimet, Paris) Who invented porcelain? About 700 AD in China, plain white porcelain pottery first begins to appear, like these cups and these bowls. What is porcelain? Porcelain is a special kind of pottery. Chinese potters working under the T'ang Dynasty discovered that if you used a special kind [...]

What is metal? Chemistry

By |2018-04-24T14:46:23+00:00June 2nd, 2017|Chemistry|

Copper ore in Iran Metals are atoms that attach themselves to other atoms in a particular way. Metal atoms, because of how their electrons are arranged, lose their electrons easily. When they join up with other atoms to make molecules, metal atoms join together by exchanging electrons. Because metal atoms join other metal [...]

Cooking pots – Copper science project – Chemistry

By |2018-04-16T17:38:03+00:00June 1st, 2017|Chemistry|

Copper-bottomed cooking pot Because heat and electricity are closely related, copper is also a good conductor of heat. This is why good cooking pots often have copper bottoms. If you have any copper-bottom saucepans at home, try this experiment: boil the same amount of water in a saucepan with a copper bottom and [...]

Copper – Atoms, Elements, and Chemistry

By |2018-04-24T14:46:22+00:00June 1st, 2017|Chemistry|

Diagram of a copper atom Copper is a kind of atom that has only one electron in the outermost ring. Copper is a fairly heavy atom, that can only be made inside a red giant star. When the red giant star has finished making copper and moved on to heavier kinds of atoms, [...]