donutgleeson:Tonight I stumbled across an encyclopedia entry on ultrasound. Ultrasound is a sound vi
donutgleeson:Tonight I stumbled across an encyclopedia entry on ultrasound. Ultrasound is a sound vibration too high frequency to be audible. It was first developed to locate submerged objects. Submarines. Depth charges. Atlantis and such. Some animals like bats, dolphins, and dogs can hear within the ultrasonic frequency. But no human can. No one can truly know what anyone thinks or feels. What’s inside Mum? What’s inside Dad? What’s inside Jordana? We’re all traveling under the radar, undetected, and no one can do a thing about it. -- source link
#submarine