I love to stay busy.

Zuckerberg rejected $2 billion for Facebook and has successfully created a company worth nearly $200 billion.

Zoos are becoming facsimiles - or perhaps caricatures - of how animals once were in their natural habitat. If the right policies toward nature were pursued, we would need no zoos at all.

Zoologists may find jobs working for government agencies, non-profit organizations, universities, museums and zoos.