Climate
Global coral die-offs signal Earth’s first climate tipping point
The corals offer a dire warning, scientists say, and suggests that more such catastrophic points of no return could occur soon — some within a decade.
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Humans
Scientists Say: Chronohygiene
Artificial lights and other aspects of modern life can confuse our body’s internal sleep clock. But a few minor changes may grant us much-needed control.
Experiment
Physics
Why are skis so long?
Let’s strap skis to an action figure to see how long sticks of wood help people glide gracefully over snow.
Technically Fiction
Animals
Rudolph’s red nose could glow through bioluminescence
Simple chemistry could give the reindeer his iconic red snout. But physics would make it look different colors to anyone who spied Rudolph from the ground.
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Winter weather
Watch This
How to make a pitched ball curve to your will
A range of tricks pitchers use to get curve all come down to the thin layers of air next to the ball — and how a ball’s spin and seams affect them.
