Damn. PETA is calling for the world's most famous polar bear to be castrated. Apparently, three-year-old Knut, star of the Berlin zoo has been getting very close to Giovanna, a female bear handlers brought to his pen last year while hers went under construction. Unfortunately, there's a snag. PETA's zoo expert and polar bear cock-blocker Frank Albrecht says that Knut and Giovanna should not be allowed to mate because they are cousins. As Discovery reports, "Any offspring would threaten the genetic diversity of the polar bear population in Germany and risk exposing the bear couple to a condition known as "incest depression…" I guess that makes sense. It would [...]