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Plankton counter: NASA’s Cloud-Aerosol LIdar with Orthogonal Polarization.

NASA’s Cloud-Aerosol LIdar with Orthogonal Polarization ("CALIOP"), an instrument aboard the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation satellite launched in 2006, uses a laser to take measurements of polar plankton. Illustration: NASA/Timothy Marvel.