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Caribbean box jellyfish may have photographic memory. A new study suggests that, with just a bunch of nerves and six eyes, these jellyfish can learn and navigate paths through mangrove roots. Jellyfish sense the distance between them and the roots by evaluating how dark the roots appear against the backdrop of water. Researchers placed alternating grey and white stripes on a maze that the jellyfish had to navigate. At first, the jellyfish bumped into the grey stripes, but soon they learned to treat those as roots that are closer to them. They then had fewer collisions, demonstrating the jellyfish were learning. This study shows jellyfish can connect different events, and even reach conclusions and act on them.