The circulatory system of humans prevents blood loss from wounds by sending platelets to block the hole.

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"Just as the human circulatory system sends platelets to a wound to prevent blood loss, oil pipelines can now transport special polymers that 'clot' oil at the site of a leak. Drawn by the pressure of the escaping liquid, these polymers press against the opening and form a temporary seal. Because each 'platelet' is electronically tagged, engineers can determine the exact location of a leak, and can repair the pipeline while it continues to operate. The technology, called Advanced Technology for Leak Location and Sealing System (ATLLASTM), works in any pressurized flow system. In addition to oil pipelines, it may prove useful in the water and chemical industries." (Courtesy of the Biomimicry Guild)
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