thumb

Would it save you a lot of time if I just gave up and went mad now?

I had learned that a dexterous, opposable thumb stood among the hallmarks of human success. We had maintained, even exaggerated, this important flexibility of our primate forebears, while most mammals had sacrificed it in specializing their digits. Carnivores run, stab, and scratch. My cat may manipulate me psychologically, but he'll never type or play the piano.

There's an old rule of thumb in politics that 90 percent of all 90 year-olds vote and 25 percent of all 25 year-olds vote.

This is where the whole ape-descended thing reveals its worth, I thought madly. Sucks to be you, quadruped. Opposable thumbs - don't leave home without them.