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Read articles, including Science News stories written for ages 9-14, on the SNK website.

Pollen grains from birch, pine and juniper — those with the best ice fostering prowess — show no similarity in surface shape, a feature scientists suspected might play a role in pollen's ability to seed clouds. Instead, new data indicate water-soluble surface chemicals are responsible. Credit: B.G. Pummer/Vienna Univ. of Tech.

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