Estimated time drivers save by using real-time GPS traffic updates
Drivers that use GPS systems with real-time traffic info spend 18% less time behind the wheel than those who do not.
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Well I can tell the difference between 2 & 8 Mp images, and I think most people could, even looking at them full screen on a monitor. Make a 2Mp image as big as your monitor screen, and do the same with an otherwise identical 8Mp image, if you don't believe me. Really, you can tell. Not screaming, just saying try it.
I do strongly agree with your overall point though, that other factors are more important than Mp in determining quality in photos; esp. the lens.
Ken Rockwell's site does a good job of explaining why megapixel counts don't matter as much as the marketing departments of camera/phone makers would have you believe:
http://www.kenrockwell.com/tech/mpmyth.htm