Why Google cares about that one in a billion chance

Google, which serves about 7 percent of the worlds overall web traffic, isnt any ordinary company.

Google Research Director Peter Norvig recently shared some of the considerations that Google takes into account when designing its infrastructure and systems to operate at Internet scale.

Source:
http://gigaom.com/cloud/why-google-cares-about-that-one-in-a-billion-chance/