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Orcas Are Considered One Species. Should They Be?

A new study suggests that two killer whale populations in the North Pacific are distinct enough to be considered separate species.

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Trump Wants the M.M.R. Vaccine Split Into Three Separate Shots. Doctors Say It’s a Bad Idea.

President Trump is calling for immunizations for measles, mumps and rubella to be given in individual jabs in three different appointments i...

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