Invisible weapon Woody Norris: Hypersonic sound and other inventions, TED Pay attention from 10:15 min. I have put written transcription under the video. 0:18 I became an inventor by accident. 0:20 I was out of the air force in 1956. No, no, that's not true: 0:25 I went in in 1956, came out in 1959, 0:28 was working at the University of Washington, 0:30 and I came up with an idea, from reading a magazine article, 0:32 for a new kind of a phonograph tone arm. 0:35 Now, that was before cassette tapes, C.D.s, DVDs -- 0:38 any of the cool stuff we've got now. 0:40 And it was an arm that, 0:42 instead of hinging and pivoting as it went across the record, 0:46 went straight: a radial, linear tracking tone arm. 0:50 And it was the hardest invention I ever made, but it got me started, 0:54 and I got really lucky after that. 0:56 And without giving you too much of a tirade, 0:58 I want to talk to you about an invention I brought with me today: 1:01 my 44th invention. No, that's not...