European trade goods (thanks to Nebraska Game and Parks Division) North American people made rapid scientific advances in the course of the 1500s AD, inspired by contacts with traders and [...]
Chinese drawing of the human organs (about 1200) Eyes and fevers Between the Middle Ages and modern times, doctors have learned a lot of new things about how human bodies [...]
History of electricity: A bolt of lightning in the sky Why did it take so long to control electricity? Like other inventions, electricity took thousands of years to develop. For [...]
A bolt of lightning in the sky Hot air and cold air are constantly moving around the Earth, as the hot air rises and the cold air sinks - that's what [...]
A lot of rubber balloons. You can create your own static electricity and then discharge it like a tiny lightning bolt. Take a rubber balloon (just a regular balloon) and [...]
The graphite inside your pencil There's nothing magic about a radio. You can build your own radio out of plain ordinary things you can get at the store. Here's how. [...]
A magnet holding a steel bar - what are magnets? What is magnetism? Magnetism is a force created by electricity, or more specifically by electrons. In any iron atom, there are 26 electrons. [...]
What is electricity? A bolt of lightning in the sky What is electricity made of? Everything in the universe is made of atoms. Those atoms are made of electricity. Atoms are [...]
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 [...]
Brio trains have magnets at the ends for your magnet project Brio trains and magnetism To see how magnets push and pull each other, get out your wooden Brio trains. One end [...]
