Uncategorized
- 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.
- 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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Math puzzle: A Loopy Holiday Gift Exchange
Solve the math puzzle from our December 2025 issue, in which a holiday gift exchange occurs.
- 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.
