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Edmund Scientific has the gel filled ant farm on sale (today only it seems) for $16.95 – “With the AntWorks ant farm, you can watch ants create 3-D tunnels in the amazing space gel. This miraculous gel is based on a 2003 NASA Space Shuttle experiment to study animal life in space and test how ants successfully tunnel in microgravity. This space-age gel serves as both habitat and nutrition for the ants. Watch as the ants turn a brick of aqua-blue gel into a fascinating colony of tunnels!”Link.