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What is a wavelength?

"A wave is made of traveling energy. Consider the waves in a swimming pool: If you jump into the water, waves travel fro

How Much Water Is There on Earth?

"About 70 percent of the planet is covered in ocean, and the average depth of the ocean is around 12,100 feet. NeedpixTh

What is voltage?

"Sometimes people get intimidated when thinking about electricity. They figure that they're not electricians and the who

What are poppies?

"According to legend, the Greek goddess of fertility and agriculture, Demeter, loves poppies -- and why not? Poppy flowe

What are the different electrical insulators?

"Even though electricity had been discovered long before, it was not until 1897 that scientists discovered electrons, up

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