Kids playing tetherball using centrifugal force Who first explained centrifugal force? When something is going straight, it always keeps going straight unless something else stops it or turns it. (The [...]
Gottfried Leibniz, a German mathematician - Enlightenment science What set off the Enlightenment? By 1650 AD, Europeans understood Islamic algebra and trigonometry better. Then they combined that with the exciting invention of the telescope and microscope (thanks to [...]
Sine wave In order to save energy, many, many things in nature move in a kind of repeated pattern we call a sine wave: water waves, sound waves, light waves, [...]
This is a sphere. A sphere is a three-dimensional circle. Or you could say that a sphere is the set of all the points that are at the same distance from the center [...]
Tomb of the scholar Qabus, Gurgan, Iran (built about 1010 AD) Who was al Ghazali? Al Ghazali was a scientist and philosopher in medieval Central Asia. More about Islamic science [...]
Diagram of an iron atom When a red giant star finishes changing all of its helium into carbon and oxygen, it then starts to turn the carbon and oxygen atoms into iron atoms. Iron [...]
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 [...]
The feet of a person with six toes on each foot Whenever protons and electrons bump into each other, or atoms bump into each other, or molecules bump into each other, [...]
