natasha ghoneim reports. >> reporter: sinkholes fascinate. one sent eight classic sports cars 60 feet below ground in february, the number of visitors to it the national corvette museum in kentucky has sored. but sinkholes can also devastate. 37-year-old jeffrey bush was swallowed as he slept in his home in florida last year. his body was never found. >> i thank the lord for not take paying daughter and the rest of my family. >> reporter: florida is one of the states where sink holes create the most damage. they happen when heavy rain washes through the soil and dissolves soft rock underneath. geologists here have been mapping the state to find out where sinkholes have already happened. but there is no database showing where sinkholes might open up. >> sinkholes are troublesome because they are hard to predict and they give very little signature on the surface. >> reporter: researchers at the university of central florida say this mini sinkhole simulator may lead to an answer. at first glance, it looks like something thrown together in a gara

natasha ghoneim has their story. >> reporter: when these 20-somethings first met, they didn't heed thee to avoid talking politics. within minutes he started grilling him on the conflict. that first conversation between an american jew, and a palestinian american was the start of a six-year friendship. it's based on bonding over the typical male things, such as sports and dating. but both young men also havement families living through the current israeli/palestinian conflict, and feel a genuine desire to engage one another on what is happening here. did either of you have opinions that changed as a result of your friendship? >> absolutely. i didn't look at mohammed as he wanted to kill me. >> and when i met an israeli that would agree with me on some issues, i found our commonalities outweighed our differences. >> reporter: the two confess talking about their friendship has stirred hatred among their respective friends, but they seem unphased. >> i consider him like my brother. >> very nice words, and the same goes for you sallom, i know we have had a lot of pushback, but i think we ha