shark and the hippo, man, those, those make me nervous because i m aware of how dangerous they are and i don t really have a lot of experience. i have to rely on the expertise of other experts. so, any day i m working on crocs, man is like a picnic, a day in the park for me. martha: you know, and one more thing about the technology, you have something you can measure how hard a shark bites down? yes. yes. we use what is called a bite force meter and we measure different species of sharks, biting force, with the bite force meter and also called a dynamometer and look at the bacteria in the shark s mouth and accelerometer to measure force and wild animals and wild places and high tech gizmos and gadgets on dangerous encounters. martha: we look forward to it. a great show tonight, new season of dangerous encounters premiers tonight, 9:00 eastern, and, pacific on nat geo wild.