Some tribes of birds will relieve and rear up the young and helpless, of their own and other tribes, when abandoned.

Zynga made social gaming and play a worldwide phenomenon, and we remain the industry leader.

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.