federal agents say they do not know. in denver, fox news. >> parts of the american west with wild weather, historic heat and downpours.flash flooding all in the mix. >> this year with the fires and the floods, it was the craziest year. we have never seen anything like this.it was really something else. >> crazy weather all right from places like arizona to seattle. millions of people have been affected. check out this scene in las vegas for sin city brought to a standstill. with this flash flooding literally prompting several rescues and has left one person missing. when will things settle down? we will have a report coming up. also scientists announce a major breakthrough concerning the building blocks of the human body. but why tampering with dna ♪