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8 09, 2017

What is rubber? History of rubber

By |2019-07-15T22:24:17-07:00September 8th, 2017|Science, South America|0 Comments

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 [...]

18 08, 2017

What is mass? Physics

By |2018-05-31T11:49:29-07:00August 18th, 2017|Physics|1 Comment

This truck has a lot of mass. Mass is a measure of the number of atoms in an object combined with the density of those atoms. Usually people measure mass in kilograms. You can tell how much mass something has by measuring how hard it is to get that thing to change directions or slow down. If you're driving a [...]

11 06, 2017

Hosting a medieval tournament – an activity

By |2017-06-11T10:29:10-07:00June 11th, 2017|Games, Medieval, War|0 Comments

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 [...]

7 06, 2017

Science in ancient and medieval China

By |2018-05-28T00:10:52-07:00June 7th, 2017|China, Science|0 Comments

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) [...]

2 06, 2017

What is hydrogen? Atoms and Chemistry

By |2019-09-05T20:42:16-07:00June 2nd, 2017|Chemistry|0 Comments

A diagram of a hydrogen atom Hydrogen is the simplest kind of atom Hydrogen is the simplest kind of atom, and in the very earliest days after the Big Bang hydrogen was the only kind of atom in the new Universe. What are atoms? What's the Big Bang? All our chemistry articles A [...]

2 06, 2017

What is helium? Atoms, elements, and chemistry

By |2019-08-07T16:25:13-07:00June 2nd, 2017|Chemistry|4 Comments

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 [...]

1 06, 2017

Helium balloon projects – Chemistry

By |2018-04-16T17:38:04-07:00June 1st, 2017|Chemistry|0 Comments

You can see that helium is lighter than air by getting a helium balloon. When you let go of it, it goes up, because the helium is lighter than the nitrogen and oxygen and carbon dioxide that make up most of the air, so the helium floats, and it pulls the balloon with it. A [...]

1 06, 2017

Carbon dioxide project with Dry Ice – Chemistry

By |2019-05-17T21:25:45-07:00June 1st, 2017|Chemistry|0 Comments

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 [...]