Is there a science to cuteness? Two-month old hippo Moo Deng joins a long line of animals celebrated for their appearance. Some think we are wired to care for big-eyed creatures.
Web goes wild for baby hippo Moo Deng
Tradition: Moo Deng (above) belongs to a noble tradition going back to 11th-century Japan and The Pillow Book of courtesan Sei Shonagon.