If 666 – the number of the beast – symbolises all that is evil, the square root of 666 must be the root of all evil.
√666 = 25.8 (to 1 decimal place) and today is the 25th of August, or 25.8
So today is the root of all evil day.
[Should you be worried? – not really, √666 is irrational, a bit like this whole theory!]