You Can Visit a National Park for Free on These Days in 2023

With more than 400 national parks scattered across the United States, it can get pricey to try to visit them all. While some are free, about a quarter of them charge from $10 to $20 per person to enter, which can add up for a family. But if you’re planning to hit up the parks next year, there are several days when…

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There’s New Hope for an HIV Vaccine

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