| The first rechargeable flashlight was introduced in 1967. The first flashlight was used in the early 1890's in New York City. LEDs (light emitting diodes) are used in virtually all electronic equipment, appliances, toys, signs, and many other products. The light created by a glow stick is the result of a chemical reaction called Chemiluminescence. LED bulbs can last for up to 100,000 hours of use, which is almost 11 years! |
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