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How Do LEDs Produce Light?
LED bulbs use far less electricity than old filament bulbs, but they still create bright light. The reason is inside a tiny semiconductor chip. In this video, you will learn how LEDs produce light, why they create very little heat, how electrons release energy as light, and why different semiconductor materials can make different colors. Unlike ...
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This trick works because the sun moves from east to west across the sky, which means shadows move in the opposite direction from west to east. The first rock marks where the shadow started and the second marks where it moved to, creating a west to east line on the ground. Standing with your left foot on the first rock and your right on the second automatically aligns your body so you're facing north, the same way a compass would. This method is called the shadow stick method and has been used as
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