Answer 6 billion.
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He never told us.
No body visits the US, go to Canada.
approximately 30% of highschools and 15% of middle schools in the U.S. have added security cameras
About 5 or 6
Human eyes are much more complicated than cameras. There are muscles that continuously change the shape of our lens in order for us to focus on any object. There are nerves which send unique signals to our brains for interpretation. The images that are mapped onto our eyes are just a series of dots and lines, but our brain translates these dots and lines into the things we see: color, texture, size and pretty much everything else. If human eyes are to be replaced with cameras, these cameras would have to be extremely advanced. There must be a source of electricity which sends the same unique signals to our brain, and that is very complicated. What's more, our eyes have a way of healing themselves and protecting from harm. Cameras can't do that.