During that time, says Merzenich, as the patients listen to and repeat words they hear, their brains create new activity patterns to represent pieces of meaningful speech, thus teaching themselves to hear again.

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In his speech, Bush acknowledged that climate change is real and that human activity is a factor.

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While the First Amendment to the U.S. Constitution protects the free speech rights of ordinary citizens, a Defense Department rule prohibits service members from engaging in some forms of political activity.

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