re: Poker & Home games/odds
It is extremely easy to spot people at the local casino that don't understand odds at 1/2. Usually all you have to do is open your eyes... Many people live don't understand the concept of not playing every single hand, let alone how to count their odds. I can't tell you how many times I've seen people call 5-10x raises preflop live and then take it to the river with crap like T4o...I know that guy knows not a thing about odds.
I was with a buddy last week and he was down to his last $25 on the button with 3 limpers in front of him, he has QJs so he just shoved(not saying I like his play per se here) and 2 limpers folded and the one goes, "Well, I have to call here, I have a King", he flips over K3o. Two 3's come on the flop and it's over but that's besides the point. To answer your question, yes it is VERY easy to spot them, just make sure you're not one of them.