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Photograph of several large clouds clumped together.
Physical World

When clouds flock together

Scientists are discovering that clumping clouds supercharge storms in surprising ways — driving heavy, deadly rainfall and flooding

Photograph of a warning label on the side of a cigarette pack. It says SURGEON GENERAL'S WARNING: Smoking Causes Lung Cancer, Heart Disease, Emphysema, And May Complicate Pregnancy.
Health & Disease

The tussle over cigarette warning labels, and the hazy future of vaping

Regulatory hurdles, industry objections and legal fights have gone on for decades over traditional tobacco. What’s in store for the next generation of smoking?

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