Some astonishing facts include:

• Google has acquired an average of ONE COMPANY EVERY WEEK since 2010
• Google hired its first in-house chef in November 1999, who went on to become the firm´s executive chef, overseeing a total of 150 employees in 10 cafes at the headquarters
• Around 1.000 of Google´s employees became millionaires at the IPO in 2004 – including masseuse Bonnie Brown

Full list: Google: 15 things you probably didn’t know on its 15th birthday | Technology | The Guardian.