Thinkers: What's The Big Idea?

Years ago I owned a dog named Ziggy. Like many people and their pets, we were embroiled in a co-dependent relationship that prompted me at times to play games I knew would annoy him. One of my favorites was to take a doggy treat--a biscuit, say, or some hamburger--drop it into a glass bottle and toss it in front of him.

The bottle was big enough to let him smell the goodies but small enough to keep him from reaching in with his tongue. He would hop around in circles, trying vainly to push his snout into the thing as...

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