. >> tanya brown on the hail engineering team designing the world's first hailstorms. >> we may not have huge fire or things like that, but we have hail every year. >> what do you use to simulate hail. >> we use water and fresh ice and create spheres and create ice stones that we can shoot with our canons. >> something like this would be 70 mph or so. >> that's hard. >> yes, they can cause a lot of damage, especially if you have a lot of these guys on your house. >> on the other side of the spectrum, wildfire. 2014 was a brutal season fueled by one of the worst droughts on record in the west and southwest. it's a major concern to the insurance industry because one out of every three homes is now built close enough to be devoured by flames. >> we're looking at the embers that travel a mile or more beyond the perimeter of the fire and land some place where there is no one watching, and then there is flame generation, flame contact and structures are lost. >> more fire retardant building materials and fewer openings for embers to fly in. >> some of the research conducted shows tiny design t