Ozone-destroying CFC chemicals are on the rise again despite ban

Earth’s atmosphere as seen from space studio023/iStockphoto/Getty Images Despite a global ban on the production of these chemicals since 2010, concentrations of some ozone-depleting chlorofluorocarbons (CFCs) in the atmosphere are rising rapidly. Scientists warn. CFCs were commonly used in refrigerants,…

Glass speaker panel makes directional audio personal

Audfly, a hearing/acoustic technology company based in Hong Kong, has been developing nifty glass-panel directional audio speakers since 2019. Using ultrasound for directional audio is certainly nothing new. The general idea is that listeners can immerse themselves in a personal…