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Contrary to myth, bats aren't blind. In fact, research shows that depending on the circumstances, bats sometimes prefer using eyesight to sound when hunting. And many fruit bats, which drink nectar rather than hunt insects, don't echolocate at all. These species have particularly sharp vision,...
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By 1920, physicists knew that most of the mass of the atom was located in a nucleus at its center, and that this central core contained protons. In May 1932 James Chadwick announced that the core also contained a new uncharged particle, which he called the neutron. Chadwick was born in1891 in Manchester, England.
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Usually contains a large amount of a matrix.
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