Big accusations require strong evidence. Please provide them, if you have them. I'm not an expert. 99% of my “knowledge” about ultrasound is from the posted ar

Big accusations require strong evidence. Please provide them, if you have them. I'm not an expert. 99% of my “knowledge” about ultrasound is from the posted article. Your thought process around AirPods makes no sense to me. I would be very surprised if active noise-canceling systems would produce sounds higher than 20KHz.