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Nearly a third less electricity used to light homes than in 1997 | Financial Times
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How Incandescent Light Bulbs Work — 1000Bulbs.com Blog
Argon is an inert gas used in light bulbs to retard the vaporization of the filament. - YouTube
Why are electric bulbs filled with argon? - Quora
Argon Lesson for Kids: Facts & Properties | Study.com
