Ever get your knees bashed by the seat in front of you during a long flight? Ira Goldman invented the <A HREF="http://story.news.yahoo.com/news?tmpl=story&u=/ap/20031024/ap_on_hi_te/airplane_knee_defender">Knee Defender</A>, a beeper-sized block of plastic that lets airline passengers prevent the seat in front of them from reclining.