A blue whale is seen in Timor waters in an undated photo. The marine mammal buttresses Cope's rule, the notion that over the course of evolution, most animals tend to get bigger. Kiki Dethmers/AP hide caption

itoggle caption Kiki Dethmers/AP

"Flavor is the most important ingredient at the core of what we are. It created us," John McQuaid writes in his book Tasty: The Art and Science of What We Eat. Getty Images hide caption

itoggle caption Getty Images

Researchers raised two groups of walking, air-breathing Polypterus senegalus — one on land and one on the water. They discovered that each group was able to adapt to be best suited to its environment. A. Morin, E.M. Standen, T.Y. Du, H. Larsson/McGill University hide caption

itoggle caption A. Morin, E.M. Standen, T.Y. Du, H. Larsson/McGill University