How smart are rats?

There is a rat infestation in my city right now, according to the guy at the hardware store. He says rats have been moving inside early this year, but he didn’t say why.

Anyway, we set a regular mousetrap style rat trap, and so far, it has been sprung twice but we have not caught a rat. The guy says that rats are smart, so catch them the first time, or you’re in trouble. I guess we’re in trouble.

Anyone have a better rat trap? Any other suggestions?