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  1. Health & Medicine

    Building a better skin barrier

    Skin is a barrier meant to keep small invaders out. Products making their way across it should boost that mission.

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  2. Physics

    Here’s how Rudolph’s light-up nose might be possible

    Simple chemistry could give the reindeer his famously bright snout. But physics would make it look different colors from the ground.

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  3. Math puzzle: A Loopy Holiday Gift Exchange

    Solve the math puzzle from our December 2025 issue, in which a holiday gift exchange occurs.

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  4. Animals

    Lions have a second roar that no one noticed until now

    A machine learning analysis of wild lion audio reveals they have two roar types, not one.