is here back with us as well working until the midnight hour, well past the midnight hour last night. paul ginsberg is with us here. i'm very excited to have him. a forensic audio expert in the business of analyzing black box recordings. so, paul, thank you. i want to start with you. it is so fascinating when i heard from you, then we've been speaking a little bit before. are you skeptical about these pulse signals because they weren't continuous like they should be? >> exactly. if there's something transmitting, you expect it to be continuous. as long as you don't go out of range of reception. now, i will tell you that 37.5 kilohertz is above our hearing range. it's almost like super hearing frequency rather than a radio frequency. in fact, i would -- i would guess that dogs or mammals, you know, may even be able to hear these sounds. like dolphins. >> you have a very simple