Scientific American presents Tech Talker by Quick & Dirty Tips. Scientific American and Quick & Dirty Tips are both Macmillan companies.

How secure do you feel on the web? It seems like every day there are more revelations about the government tapping your phone calls, reading your email, and watching what you do online. In this week's episode, Tech Talker will be talking about the dark side of the web that Google won't show you. 

The internet is huge. I'm sure many of you know that, but it's almost unbelievable that when Googling the term "cat videos" that Google can serve up nearly a billion hits from all across the web. Now keep in mind there are 7 billion people on the planet. It's mind boggling.

But what if I were to tell you that Google and other search engines can only search a fraction of the web. This number varies from source to source, but the most generous term that I've heard is that Google can search about 10% of the world wide web. So what's in the other 90%?

Well I can assure you it's probably not another billion cat videos!



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