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Some kinds of materials change color when their temperature changes. The metal iron is one such material. In its normal state, iron is a gray-black color. When heated, though, it begins to change colors. First, when it reaches about 1750 degrees Fahrenheit, iron will turn red. Then, when it reaches about two thousand degrees Fahrenheit, it will turn yellow. Finally, at even higher temperatures, iron will turn white.

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In the late 1880s, John Muir was worried about the wilderness around Yosemite Valley in California. The natural beauty of Yosemite was being threatened by grazing livestock,  which had overrun the area. In the late summer months of 1890, Muir wrote articles urging people to protect Yosemite. His hard work paid off in October of that year, when Congress created Yosemite National Park. It was the country's third national park. Yellowstone had become the first, in 1872.

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In 1953, Edmund Hillary and his guide, Tenzing Norgay, became the first people to reach the top of Mount Everest. Hillary later joined a group of climbers who became the first people to scale Mount Herschel in Antarctica. In 1986, Hillary and American astronaut Neil Armstrong flew to the North Pole.  That last trip made Hillary the first person to have been to both poles and the top of Everest.

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 Have you ever seen a lava lamp? You can make something that looks like one at home. First, fill a tall, clear drinking glass with water. Make sure to leave an inch of room at the top. Next, slowly add a quarter cup of vegetable oil. Finally, sprinkle a pinch of salt on top. The "lava" will begin moving up and down in the glass.

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 Jacob and Wilhelm Grimm were German brothers who collected folk songs and stories. Their first collection, later known as Grimm's Fairy Tales, appeared in three volumes between 1812 and 1822.  In 1826, they published a collection of Irish fairy tales that they had translated into German. Later, the brothers began working on a German dictionary. Both brothers died, though, before the dictionary was finished.