Regular readers of this blog know by now that I have a fear of heights. Yet every once in a while I challenge my fear. Like ziplining. I ziplined once before, in a cave, and was weak-kneed the entire time. By the time I got to the last run, taking off from a platform that had a 70-foot sheer drop-off, I almost couldn’t do it but there was no turning back. So when I planned to zipline near Las Vegas with Flightlinez Bootleg Canyon, I was a bit apprehensive but not in panic mode. Here’s why.