Blue is the color of the sky and sea. It’s also the color of blue whales and blueberries though neither of those are very blue at all. Did you know that no vertebrate, not a single bird or mammal or reptile known to human kind, makes a blue pigment. What? How can that be you say. What about butterflies, peacocks, and blue jays? Watch this educational TED video to discover nature’s secret way to engineer blue.