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I was curious since the new rink at AMNH uses synthetic ice. Pretty interesting… “Skating on refrigerated ice, the blade increases the temperature of the microscopic top layers of the ice reducing drag and causing the blade to glide on top of the ice. The most realistic recreation of natural ice is found in the high-end synthetic ice panels that incorporate microscopic beading on the surface to simulate the slight melting of ice under a skate blade.”

Apparently it’s been around since the 1960’s but didn’t overcome major shortcomings until recently.