balloons

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What is rubber? History of rubber

By |2019-07-15T22:24:17-07:00September 8th, 2017|Science, South America|

A big rubber tree in Mexico Olmec people, living in southern Mexico, invented rubber about 1600 BC. It was just as they were beginning to build their empire. Rubber starts out as the sap of a Central American tree - the rubber tree. You tap the tree or cut it down for the sap. Then you mix the sap [...]

Hosting a medieval tournament – an activity

By |2017-06-11T10:29:10-07:00June 11th, 2017|Games, Medieval, War|

Modern-day re-enactors having a tournament Tournaments were a common form of entertainment in the Middle Ages. A group of knights came together at the castle of some powerful duke or king, and they would spend the day fighting each other for prizes, sometimes one against one, and sometimes in teams. Tournaments took the [...]

Science in ancient and medieval China

By |2018-05-28T00:10:52-07:00June 7th, 2017|China, Science|

Chinese science: a double-action piston box bellows (China) What are some Chinese inventions? Chinese scientists started inventing a lot of new things around 500 BC, during the Warring States period. That might be because of the formation of the first empires and the rise of the Silk Road. (More about the Silk Road) [...]

What is helium? Atoms, elements, and chemistry

By |2019-08-07T16:25:13-07:00June 2nd, 2017|Chemistry|

Diagram of a helium atom Helium is a very simple atom. Helium is a simple atom. The nucleus of a helium atom has two protons and two neutrons. Around the nucleus, there are two electrons. The only atom simpler than helium is hydrogen. More about hydrogen What are atoms made of? All our chemistry [...]

Carbon dioxide project with Dry Ice – Chemistry

By |2019-05-17T21:25:45-07:00June 1st, 2017|Chemistry|

Frozen carbon dioxide (dry ice) - for your carbon dioxide project How can you see carbon dioxide? Normally you can't see carbon dioxide because it is an invisible gas. But if you get some frozen carbon dioxide (also called dry ice), you can see it as chunks of ice. You can get dry [...]