"Hearst Magazines and AOL may earn commission or revenue on some items through these links." Medieval knights may often have been equipped with some intimidating armor, but while a metal suit could be ...

“The key innovation is that sound is only generated where two beams intersect, making it possible to deliver audio to a precise spot while keeping the beams themselves silent,” describes Penn State ...

A pioneering method has emerged for manipulating laser beams using sound waves alone. These days, powerful laser beams are essential in scientific research, from particle accelerators to nuclear ...