liquidat and others wrote in with the news that the DNS Root Servers were attacked overnight. It looks like the F, I, and M servers felt the attack and recovered, whereas G (US Department of Defense) and L (ICANN) did less well. Some new botnet flexing its muscle perhaps? AP coverage is here.
At the source of every error which is blamed on the computer you will find
at least two human errors, including the error of blaming it on the computer.