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  1. Ars Technica (arstechnica@mastodon.social)'s status on Tuesday, 26-Dec-2023 23:04:18 JST Ars Technica Ars Technica

    Watch sand defy gravity and flow uphill thanks to “negative friction”

    Applying magnetic forces to single iron oxide-coated particles spurs strange collective motion.

    https://arstechnica.com/science/2023/12/watch-sand-defy-gravity-and-flow-uphill-thanks-to-negative-friction/?utm_brand=arstechnica&utm_social-type=owned&utm_source=mastodon&utm_medium=social

    In conversation about a year ago from mastodon.social permalink
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