Two penguins are standing on an iceberg. Penguin No. 1 says to Penguin No. 2, "Looks like you're wearing a tuxedo." Penguin No. 2 replies, "...Maybe I am." Now that we've shared our favorite surreal penguin joke (OK, our only surreal penguin joke), it's time to get serious. Penguins must carry out the dual responsibilities of being tremendously cute and being barometers of the Antarctic's stability. Up in the Arctic, polar bears face a similar burden. A new exhibition at the Saint Louis Science Center (5050... More >>>