They aren't building only better mice...they are getting smarter too.
We once had a mouse in our kitchen...He would sit on top of our toaster in the morning and just stare at us. I swear he stuck his tongue out. We put mouse traps everywhere, full of cheese, salami...the best kind! He would nibble just around the edges, and leave the rest for us.

He got so trusting, that after a few weeks, Hubby actually caught him in his bare hands. He carried him out to the fields and let him go. Now I hate mice...but that little fellow I missed.
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A friend is a gift you give yourself.
-- Robert Louis Stevenson