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The video tantalizingly beings with a pan across the table, revealing one marble machine after another. YouTube user denha makes them, in vast quantities and astounding quality. The most amazing scene is at 4:35. It shows one machine hurling steel marbles into a bucket with perfect accuracy.
-via reddit
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Somehow they had to know that before they started digging their trench, otherwise, once they broke through to the water, the ocean on one side would have immediately poured into it and overflowed the ocean on the other side.