Prusa upgraded MK4S by ramping up the flow, increasing the cooling, and developing a mobile app. Prusa upgraded MK4S by ramping up the flow, increasing the cooling, and developing a mobile app. Post navigation CrowdStrike President graciously accepts Pwnie Epic Fail award at DEF CON hacking conference Massive leak of US personal information shows up on hacking forum, including almost 2.7 billion records