Gentoo Penguins live in the frigid waters of the Atlantic. Only recently have scientists begun to unravel why penguin feathers don’t freeze. An electron microscope revealed tiny pores on the feathers that trap air, making the surface water repellent. This feature, plus a special coating oil from the preen gland, prevents water build-up and delays freezing. Engineers could attempt to apply these principles to prevent icing on plane wings. Learn more at BirdNote.org.