Health & Medicine
Ah-choo! Healthy sneezes, coughs sound just like sick ones to us
Think you can tell a sick cough from a healthy one? Think again. New research finds the human ear isn’t sensitive enough to tell the difference.
Word of the Week
Tech
Scientists Say: GPS
A GPS system relies on satellites orbiting the planet, constantly sending signals back to receivers on Earth.
Explainers
Environment
Explainer: How and why fires burn
A fire’s colorful flame results from a chemical reaction known as combustion.
Experiments
Chemistry
Big rock candy science
Instructions for making your own rock candy say to dip your stick or string in sugar before putting it in your sugar solution. Does that matter?
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Wiggly wheels might help rovers plow through loose lunar soils
New design lets wheels ascend hills too steep for regular robots and paddle through loose soils without getting stuck.
