When an editor for The Economist (Leo Mirani), received a free mini USB-powered fan at the Singapore summit (where President Trump and North Korean leader Kim Jong-un met) he chose to not plug it in. He didn't know who made this fan, where exactly it came from, or if it had anything on it. However, he did know that any USB device presents the possibility of malware. Whether it's a fan, thumb-drive, mouse, keyboard (or anything else that plugs into your phone or laptop) it could pose a threat to your security. And when all the journalists at a high-stakes meeting - between two countries who have been known to partake in cyber-warfare - are given USB devices, it's best to err on the side of caution.