![](https://sp-ao.shortpixel.ai/client/to_auto,q_glossy,ret_img,w_640,h_360/https://readof.com/wp-content/uploads/2023/12/watch-sand-defy-gravity-and-flow-uphill-thanks-to-negative-friction.gif)
Watch sand defy gravity and stream uphill due to “adverse friction”
There’s not often time to put in writing about each cool science-y story that comes our means. So this 12 months, we’re as soon as once more working a particular Twelve Days of Christmas collection of posts, highlighting one science