The metamaterial structure the team designed is made of a single linear elastic material. (Courtesy: Yi Chen, KIT) An unusual type of sound wave that can travel backwards in space and has previously ...

(Nanowerk News) Acoustic waves in gases, liquids, and solids usually travel at an almost constant speed of sound. So-called rotons are an exception: their speed of sound changes significantly with the ...

If it were easier to pronounce, you could call it a "rellor retsaoc." That's "roller coaster" backwards, and Six Flags Over Georgia is going forward with plans to make its Great American Scream ...