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What causes the seasons? Earth science

By |2018-04-24T15:45:14+00:00August 20th, 2017|Physics|

This is why it's hotter in summer and colder in winter. The reason it is sometimes winter and sometimes summer is that the Earth spins on a slightly tilted axis. You can see the red axis in the picture here (though really there is no axis to see; it's a direction, not a real stick). [...]

What are magnets? Physics and electricity

By |2018-05-31T11:49:22+00:00August 16th, 2017|Physics|

A magnet holding a steel bar Magnetism is a force created by electricity, or more specifically by electrons. In any iron atom, there are 26 electrons. Each electron has a tiny bit of negative charge. The way these electrons behave is impossible for us to imagine, because it's not like anything we can see. But we can [...]

Christmas – American holiday

By |2018-04-24T11:05:18+00:00August 14th, 2017|History|

Big Horn Medicine Wheel in Wyoming (1300 AD) Even before 1500 AD, people in North America celebrated a winter religious festival when the days stopped getting shorter and began to get longer again. Many people built stone structures to make it easier to know when the solstice had arrived. When European settlers arrived, they brought with them some new ideas [...]