1. Charles Knight with 2010 Vivian, SD, hailstone

    All hail

    There was no gold medal, no podium ceremony, and definitely no tears from the losers on 30 July, but there was a new national champion. On that date, NOAA proclaimed that a South Dakota hailstone had surpassed all contenders in both size and weight.

    • Weather

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  2. Eruption of Mount Pinatubo, 1991

    Getting serious about geoengineering

    Blossoming interest in geoengineering research over the last few years has ripened into a deeper consideration of the topic by scientists, policymakers, and the public. This interest has been boosted by a relative lack of action on mitigating climate change.

    • Climate

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