I have been to the Tar Pits as a kid. It is a great place, full of science and history. I don't remember seeing any ghosts, witch doctors, or anything else metaphysical twirling about the last time I was there. Imagine my disappointment that I missed the magic stones are quite a surprise. Could have used them to improve my grades or learn to fly... To be honest, I feel cheated that I couldn't buy those magic marbles.
I guess I missed the boat. Sadly too, I am disappointed that these marbles were 'cut by hand'. I suspect the hand made quality by hundreds of underaged third world factory workers is where the real magic comes from. Everyone knows that child labor obviously increases their super powers.
Here is a great pic from our intrepid pseudoscientist that shows all the wonderful powers you can get from these stones (sadly not the power of flight or smiting of enemies, but ok for the price).