The idea was to check whether the animals would rather build a nest in the cooler cage or move to the warmer one, possibly tugging nesting material along with them strand by strand.

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"The Fish and Wildlife Service is really interested in trout habitat, designing culverts so fish can move to cooler waters, " Prickett said.

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It even knows what section of the cooler or shelf position will move the most products.

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Incoming cooler ambient air from the other end of the piston causes the helium to contract and move the piston to generate AC power.

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