Scanning parks and beaches with one of these can be a unique and fascinating hobby.

The disc-shaped resonator measures less than 2 centimeters across, yet the innocuous device is eavesdropping on spacetime. It’s a newly built acoustic wave resonator, and in its first 153 days of ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Whether stashed by Captain Kidd or as a plot point in The Goonies, buried treasure has a certain allure ...