image: A duckling imprinted on two cubes approaches two spheres during testing. This material relates to a paper that appeared in the July 15, issue of Science, published by AAAS. The paper, by A. Martinho III at University of Oxford in Oxford, UK, and colleagues was titled, "Ducklings understand and imprint on the relational concept of 'same or different." view more
Credit: Antone Martinho