Even Google can screw up. If you noticed yesterday that when you hit a search you got the error screen “may harm your computer,” you weren’t the only one. The period only lasted about 40 minutes but we guess that was long enough to freak a few Googlers out. Their engine works with stopbadware.org that helps find malicious software then sends a list to them. After updating Saturday, Google accidentally flagged all of their sites. The company attributed the problem to “human error.”