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The Australian wildfires in 2019 and 2020 were historic for how far and fast they spread, and for how long and powerfully they burned. All told, the devastating “Black Summer” fires blazed across more...
UMD Physicists Discover “Smoke Rings” Made of Laser Light（图）
UMD Physicists Smoke Rings Laser Light
2016/9/9
Most basic physics textbooks describe laser light in fairly simple terms: a beam travels directly from one point to another and, unless it strikes a mirror or other reflective surface, will continue t...