Padat Shrestha of Dallas, left, and Ricky Hohler of Overland Park, Kansas fight robots with the help of Normazd Romer of Mountain View, Calif., right, in the LogicHub booth at Black Hat USA cybersecurity conference at Mandalay Bay in Las Vegas Wednesday, Aug. 8, 2018. K.M. Cannon Las Vegas Review-Journal @KMCannonPhoto