Great white sharks are at the top of the food chain in our oceans. They were once feared, misunderstood and a mystery. Now, there is intrigue and excitement about what's happening off our coast.
jon: what a race, william juice in california, thank you. jenna: we have more on that mysterious case of a missing american south of the border. a new theory on why this man did not return from a day of jetskiing with his wife on the mexican side of falcon lake. who is behind it and why. also we rely on it to get where we re going, now there is a new push to use gps technology to strabg sharks, of all things track sharks, of all things. will it take us feel any sa fer in the water next summer? that s a good question. we ll ask it next. [singing] en try this. new and improved freestyle lite® blood glucose test strip. sure, but it s not gonna- [ bp ] wow. [ man ] yeah, that s the patented eestyle zipwik™ design. [ woman ] did it just ta the blood? target the blood? yeah, it drew it right in. the test starts fast.