Because thru observation, I have noticed alot of movement in those times. So, for a newbie, those times could be good or bad, and happen very fast. So, its just best to not enter at those times. Honestly, even half past the hour isnt good either, lol..
My entire logic of trading, is keep drawdown as low as possible.. But then again, I have to be precise with my trading, because I use alot of risk..