I've got Google. I can't really be bothered though...
Yes, that's right - I'm THAT naive
Nobody is arguing that cats are as advanced as humans - but they're clearly more advanced than, say, a snail. They also often show evidence of an uncanny ability to gauge human emotion. Of course that is hard to quantify, so it's usually put down to silly people simply personifying or anthropomorphizing by other people who don't actually own cats, or view cats as something that just drifts in and out of the door a couple of times a day.
In simple terms, it's hard to understand if you a, don't have a cat, or b, have a cat that's not very nice, and use that as an example of all cats ever.
My cat clearly expresses and feels emotions.