Physical Science





Helium in the Universe

Helium (He) plays an exceptionally large role in the universe since the sun is composed of twenty-five percent of it; the other seventy-five percent is hydrogen. Helium is second only to hydrogen in being the lightest and most plentiful of…
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Growing Alum Crystals

Growing crystals is a simple, rewarding pursuit! You have to feed growing pets, and water growing plants, but growing rocks is a hands-off activity. You can spend afternoons growing different kinds of crystals, and if you have a spare bookcase…
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Crystal Rock Garden

Many people spend money on overpriced “grow your own rock garden” kits, when they can just as easily make them for free! All you need are some basic supplies, patience, and a sense of curiosity. What’s that? You have all…
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