Pingpong balls score big as sound absorbers
From American Institute of Physics 25/10/23 Long-term exposure to low-frequency noise can cause numerous health problems, but the solution may be found in an unexpected object, a pingpong ball. Conventionally thought of as the hollow plastic balls that speed through the air during a fast-tempo game of table tennis, with a few modifications, pingpong balls […]
Boom, crackle, pop: Sounds of Earth’s crust
From Massachusetts Institute of Technology 17/10/23 If you could sink through the Earth’s crust, you might hear, with a carefully tuned ear, a cacophany of booms and crackles along the way. The fissures, pores, and defects running through rocks are like strings that resonate when pressed and stressed. And as a team of MIT geologists […]