Brendan O'Toole, Ph.D., chairman and professor of mechaincal engineering at UNLV, speaks about his role in the making of Hailey Dawson's 3-D printed prostehtic hand during an interview in Las Vegas, Saturday, Oct. 14, 2017. Dawson, 7, who was born with Poland syndrome leaving her physically underdeveloped, will be throwing a first pitch at the MLB World Series. (Joel Angel Juarez/Las Vegas Review-Journal) @jajuarezphoto