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Coronavirus

Eighteen images, arranged in a spiral, show how a lab-grown snowflake develops over 58 hours.
Physical World

How snowflakes grow

The cold, finicky science of ice crystal formation

Three panels show a cow, a chicken and a woman, with viral particles moving from each animal to the woman.
Health & Disease

Everything you need to know about bird flu

How dangerous is it? Where did it come from? H5N1 influenza’s origins stretch back to the 1990s, and key events paved the way for the outbreak we’re seeing today.

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