COLUMBUS, Ohio (AP) — The vaccinations that U.S. schoolchildren are required to get to hold terrible diseases like polio, measles, tetanus and whooping cough in check are way behind schedule this year ...

COLUMBUS, Ohio — The vaccinations that U.S. schoolchildren are required to get to hold terrible diseases like polio, measles, tetanus and whooping cough in check are way behind schedule this year, ...

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Overview: Free tools that support modern learning help students manage assignments, notes, and schedules across devices ...

If there are nine people in a room and every person shakes hands exactly once with each of the other people, how many handshakes will there be? How can you prove your answer is correct using a model ...