How to Tell Whether Your Window Fan Should Be Facing In or Out

For many people, window fans are essential tools for keeping cool—especially if they don’t have (or are cutting back on) air conditioning. Even with access to AC, window fans can provide an otherwise-stuffy room with some much-needed ventilation.

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The Complex Social Lives of Viruses

New research has uncovered a social world full of cheating, cooperation, and other intrigues, suggesting that viruses make sense only as mem...