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The content of this article has been delivered to you via internet fiber-optic links. Today most phone conversations, fax transmissions and almost all internet and email traffic travel at the speed of light between cities and continents via fiber-optics. An optical fiber (or fiber-optics cable) is to light what a copper wire is to electricity, a ...

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Engineering

GPS (Global Positioning System)

The GPS, or Global Positioning System, is the high-tech application of one of the most fundamental principles of geometry. Surveyors routinely use geometry and triangulation to map and lay out areas ... Continue reading

GPSGlobalPositioningSystem
Astronomy

It's Dusty Out There

There is no lower limit to the size of the solid particles that move around the Sun. Small asteroids grade downward into large meteoroids and then into smaller pebbles and so on down to the tiniest ... Continue reading

ItsDustyOutThere
Medicine

The Neurological Complications Of Lyme Disease

Lyme disease is caused by a bacterial organism that is transmitted to humans via the bite of an infected tick. Most people bitten by an infected tick develop a characteristic skin rash around the area ... Continue reading

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Chemistry

What Is Reduction?

Long ago, in a laboratory far, far away...before the development of the atomic theory we now use, scientists believed in a principle called animism, and that the chemistry of different materials was ... Continue reading

WhatIsReduction

Lunar Explorations

LunarExplorationsEver since the beginning of intelligent life on Earth, the moon has been a focal point of human curiosity. Galileo’s discovery in 1610 that the moon had craters, valleys and mountains, instead of the smooth surface previously believed, only added to a burning desire to learn more.

So when exactly did our up-close-and-personal explorations begin? It was in 1959 that the Russians started sending their Luna probes to the moon. The first man-made object to land (actually, crash) on the moon was Luna-2. That same year Luna-3 sent the first images of the far side of the moon – the side hidden from the Earth for more than 4.5 billion years. The USA caught up with the Russians in 1969 when the first manned mission, Apollo 11, landed on July 20. 'That's one small step for man, one giant leap for mankind,' Neil Armstrong proclaimed as he stepped onto the lunar surface. (He was supposed to say 'one small step for a man,' but he misspoke under the pressure of that historical moment.) Since that day, five more manned Apollo missions have landed on the moon. The last one, Apollo 17, left the moon on December 14, 1972, and no humans have returned since. All together only ten humans, none of them women, have walked on the surface of the moon.