Scientists have discovered the ultimate case of regeneration: Some decapitated sea slugs can regrow hearts and whole new bodies. Biology researcher Sayaka Mitoh explains the genesis of the study published in Current Biology on Monday: She saw something bizarre in her lab one day. A sea slug had decapitated itself and the head kept on moving and living. Then a couple more did the same, according to a So the doctoral student and Nara Women’s University aquatic ecology professor Yoichi Yusa tried it themselves, cutting the heads off 16 sea slugs. Six of the creatures started regeneration, with three succeeding and surviving. One of the three even lost and regrew its body twice. Two different species of Japanese sea slugs did this regeneration trick. More on the fascinating study from the AP: