Health & Medicine
Two cities stopped water fluoridation. Kids’ teeth suffered
As calls to end fluoride in water get louder, worsening dental health in children of Calgary, Canada, and Juneau, Alaska, offer a cautionary tale.
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Scientists Say: Interstellar medium
Radiant energy and primordial space dust span the vast reaches between star systems.
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Chemistry
Experiment: Blow the best homemade bubbles
What’s the best recipe for blowing the most impressive bubbles? Let’s find out.
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Health & Medicine
Explainer: What is cancer?
Cancer is a whole collection of diseases with one thing in common: all develop when the body’s cells start dividing out of control.
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Narwhals may use their enormous lance-like tusks to play
Video shows narwhals using their tusks to prod — even flip — fish they don’t target as prey. It’s the first reported evidence of these whales playing.