Everyone has a colon, and some of them get cancerous, so periodically us older people need to have a professional take a good close look to be sure everything is alright. And so someone invented the colonoscopy (colon, from the anatomy of the large intestine, and -oscopy from the Greek let’s take a good long look up where the sun doesn’t shine). (There are other colons that people generally don’t know how to use properly: those will be ignored here; so will semicolons. Actually, anatomical and political semicolons might be really problematic. But we won’t go there.)

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