![Physicists discover ‘smoke rings’ made of laser light](https://i2.wp.com/scienceblog.com/wp-content/uploads/2016/09/UMD-physicists-discover-smoke-rings-made-of-laser-light-.jpg?resize=400%2C250&ssl=1)
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 traveling along an
arrow-straight path, gradually expanding in size...
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