If you use an iPhone, iPad, iPod, Mac, Apple TV, Apple Watch or anything Apple, look for an OS update and do it now. The latest updates (for iPhones it's iOS 10.3.3) fixes a serious flaw in the WiFi chip. The flaw effectively allows someone to run code on your device. I've seen places rate this flaw as a 9.8 out of 10 in terms of seriousness.

Yeah, I know...we all put off those updates. This is one that you absolutely should not delay in downloading.