By Richard Brill Posted on October 21, 2016 • Updated on October 27, 2016 at 3:16 pm
The hottest lights on the market today are cool light-emitting diodes, or LEDs. LEDs are made from semiconductors, which differ from conductors in the way their crystal structure holds electrons.
By Richard Brill on October 7, 2016 • Updated on October 27, 2016 at 3:17 pm
By Richard Brill Posted on October 7, 2016 • Updated on October 27, 2016 at 3:17 pm
It’s nearly certain that each of us consumes some fermented food or beverage daily. Bread, cheese, yogurt, beer, cured salami, cocoa and pickled foods such assauerkraut and kim chee are some examples of fermented products.
Using nothing but a compass as a navigational tool, ancient mariners from China to Sumer navigated the world’s oceans. Even in the modern age of GPS, the magnetic compass is anunfaltering navigational tool for seagoing vessels, airplanes and hikers on the ground.
When a tree falls and there is no one there to hear it, does it make a sound? It depends on what you mean by sound. We think we know what it means because our perception of sound is second in importance only to sight.
By Richard Brill firstname.lastname@example.org Posted on December 4, 2015 • Updated on December 4, 2015 at 2:37 am
The earliest clocks relied on the movements of the sun and stars. A sundial consists of a stick or gnomon that casts a shadow on a flat surface with numbers to represent hours or other measures of time.