This weekend in Las Vegas, the huge cybersecurity event Black Hat USA kicks off, followed immediately by the other big cybersecurity event of the year, Def Con.  There are always some big hacker stunts at these events — hackers already broke into a voting machine as a Def Con demonstration. But after a year of major data breaches, there's also a sense of security fatigue. Chester Wisniewski is a principal research scientist at Sophos, a security firm. He talked with Marketplace’s Molly Wood about whether that fatigue is affecting business. (08/02/2018)