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Traditional light bulbs pass electricity through a filament, which results in energy being released as both heat and light, leading to a lot of heat being wasted.
BBC: LED light bulb to last more than 20 years
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The research team uses a RepRap 3D printer and a custom extruder head to print a filament network composed of sucrose, glucose and dextran which is later encased in a bio-gel containing living cells.
ENGADGET: Researchers use 3D printer, sugar, to create a fake artery network for lab-grown tissue
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The newest Intel Pentium chip has such densely packed circuits that it consumes the same power as a 100-watt lightbulb with a filament burning as hot as 4, 500 degrees Fahrenheit--one you'd have to wear mittens to unscrew.
FORBES: Magazine Article
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Edison bulbs function by making a Tungsten filament very hot, and a hot object glows: radiating energy on a broad spectrum of wavelengths, only a small part of which is visible to the eye.
FORBES: LED Light Bulbs Mature At Last
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In the video below from NASA's Solar Dynamics Observatory, we see a massive filament eruption.
ENGADGET: Alt-week 9.8.12: Moon farming, self powered health monitors and bringing a 50,000 year-old girl to life
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In fact a major filament of hope and opportunity is how much remains to be done to make our everyday world better and more appropriate to need.
FORBES: How to Downsize Yourself
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This was also a triode: a glass tube containing a heated metal filament which emits electrons, a plate that collects them once they have accelerated through the tube, and a metal grid in between.
ECONOMIST: The middle age of the transistor
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Also, instead of having a single metal filament release the electrons, it relies on myriad carbon nanotubes to do the same thing.
ECONOMIST: Modern X-ray technology
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The solution was a vacuum cap that sits over the whole unit, much like the glass globe surrounding the tungsten filament in a flashlight bulb.
FORBES: Pip-squeak Power Plant
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Many of the tiny metal pieces are cut with a new mechanical process that runs electric current through a hair-thin filament.
FORBES: Time Is Money
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You'll have to put a bit more pressure on the filament than you'd expect, and the pulling motion of the motors is subtle enough that you might not notice it at first.
ENGADGET: MakerBot Replicator impressions: the dawning of 3D printers in every home?