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Make a Cold Pack from Hot Ice

There are a few different ways you can make your own chemical cold pack. You could mix citric acid and sodium bicarbonate or you could mix barium hydroxide with an ammonium salt. If you have baking soda and vinegar, you can prepare your own hot ice or sodium acetate and then use the hot ice to make a cold pack.
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Mikhail Gorbachev: The Last General Secretary of the Soviet Union

Mikhail Gorbachev was the last General Secretary of the Soviet Union. He brought about massive economic, social, and political changes and helped bring an end to both the Soviet Union and the Cold War. Dates: March 2, 1931 - Also Known As: Gorby, Mikhail Sergeevich Gorbachev Gorbachev's Childhood Mikhail Gorbachev was born in the small village of Privolnoye (in the Stavropol Territory) to Sergei and Maria Panteleyvna Gorbachev.
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Vacuum Definition and Examples

Vacuum Definition A vacuum is a volume that encloses little or no matter. In other words, it is a region that has a gaseous pressure much lower than that of atmospheric pressure. A partial vacuum is a vacuum with low amounts of matter enclosed. A total, perfect, or absolute vacuum has no matter enclosed.
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The Native American Heroes Who've Made History

The Native American experience is not just characterized by tragedy but by the actions of the indigenous heroes who've made history. These trailblazers include writers, activists, war heroes and Olympians, such as Jim Thorpe. A century after his athletic prowess made worldwide headlines, Thorpe is still considered to be one of the greatest athletes of all time.
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Collocations With Money

An important step to improving your English vocabulary is to not only learn the appropriate terms but to learn the words that commonly go together with those terms. These word combinations are often, adjective + noun, verb + noun, and noun + verb pairs. Each of these collocation sheets provide collocations for commonly used words arranged into categories.
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The Duryea Brothers of Automobile History

America's first gasoline powered commercial car manufacturers were two brothers, Charles Duryea and Frank Duryea. The brothers were bicycle makers who became interested in the new gasoline engines and automobiles. Charles Duryea and Frank Duryea were the first Americans to build a successful commercial automobile and the first to incorporate an American business for the expressed purpose of building automobiles for sale to the public.
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