To attain happiness in another world we need only to believe something; to secure it in this world, we must do something.

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.

Zuck is unemotional. He doesn't get influenced by ego.

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.