Physical Science







Alexander Graham Bell

Alexander Graham Bell was a Scottish-American inventor born March 3, 1847 in Edinburgh, Scotland. His father was an internationally recognized teacher of visual speech. He taught in Scotland and in Canada, where the family moved in 1870. As a boy,…
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How Thallium is used Today

Some industries in this century employ compounds of thallium, a toxic metallic element, for a variety of commercial purposes. However, certain properties of this substance probably restrict its overall usefulness in the marketplace. Thallium often figures amongst the harmful materials…
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