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The "wick" used for the heat pipe is made of finely etched lines that are about as deep as fingerprints. The liquid is able to defy gravity--much like a kerosene lamp wick--as it flows between several locations and an arbitrary end point.
"That is the uniqueness--the ultra-fine etching," said Kevin Krewell, a senior editor at the Microprocessor Report. "Most of the heat pipes are tubes about the width of a piece of spaghetti or thicker."