PrimalProgrammer asks PaleoPathologist: What is this Paleo thing anyway?

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PrimevalGeoPhysicist, PaleoPathologist, and PrimalProgrammer captured a few years back at Tribal Rite celebrating 50th Birthday of PrimevalGeoPhysicist. PrimalProgrammer  wrote recently with a question:

First I’d like to find out:  What is a “Paleo” Diet? 

     I haven’t really read up on it. Is it wandering through forests, picking up walnuts and strawberries off the bushes, hunting for food, and having a great time with the guys and fermented honey booze back at the caves? (I’m visualizing the starting part of 2001: A Space Odyssey here.)

    What’s new about the PaleoDiet, especially compared to Atkins / South Beach high protein, very low carb diets?