If your energy is as boundless as your ambition, total commitment may be a way of life you should seriously consider.

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 study the behavior, physiology, classification and distribution of animals, whether they are living or extinct.