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Who built Great Zimbabwe? Central African history

By |2019-03-28T13:05:35-07:00October 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 about [...]

Electromagnets – electricity and magnets

By |2019-05-27T07:14:24-07:00August 16th, 2017|History|

There are electromagnets inside stereo speakers When did people invent electromagnets? In the early 1800s AD, about 200 years ago, scientists in Denmark and Britain figured out another way to make magnets. (These countries had a lot of scientists thanks to colonization, slavery, and control of trade). History of electricity History of slavery Europe's [...]

Magnet project – electricity

By |2019-02-23T16:40:02-07:00August 16th, 2017|Physics|

Brio trains have magnets at the ends. Brio trains and magnetism To see how magnets push and pull each other, get out your wooden Brio trains. One end of each car has a positive magnet and the other end has a negative magnet. More about magnets And electromagnets An electromagnet project All our physics articles [...]

Electromagnet project – Electricity – Science

By |2019-05-27T09:55:53-07:00August 16th, 2017|Physics|

Build your own electromagnet with a nail, some copper wire, and a battery What will I need? 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 [...]

Mississippi People – Native Americans

By |2018-04-07T17:05:36-07:00August 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 |2018-04-23T14:30:47-07:00July 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 |2018-08-08T07:11:45-07:00June 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 |2018-04-24T14:46:23-07:00June 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 |2019-04-24T16:50:44-07:00June 1st, 2017|Chemistry|

Copper-bottomed cooking pot: a science project Why do pots have copper bottoms? 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. What is copper? What is heat? All our chemistry projects Copper, iron, or aluminum pots? If [...]

Copper – Atoms, Elements, and Chemistry

By |2019-04-24T18:25:23-07:00June 1st, 2017|Chemistry|

Diagram of a copper atom What is copper? Copper is a kind of atom that has only one electron in the outermost ring. What's an electron? What are atoms? A project with copper pots All our chemistry articles Where does copper come from? Copper is a fairly heavy atom, that can only be [...]