do we control it, is it natural or man made. >> frommer years of evolution that trained us. >> we learned instincts when things were simple. bpa and things arer more complicated but we use the emotional side more to gauge what feel s scary. >> we need to be fearful from days when our ancestors may have been eaten by the tigerer you have to fear the tiger. >> and mostly it works. here we are talking tonight. >> so far. >> it is prone to error. the important part of the program is thor errors can be dangerous by themselves. it's a risk, what i call the risk perception gap, wor ary too much or too little. it's dangerous.s. >> we worry about the wrong things. we don't pay attention to the right ones. >> we do dangerous things because we don't take them seriously. >> you write don't get your information from dr. googlele. >> but go to sources that you can trust. some are on google. some are on google and you can't