Zero to $400 billion, good for the second-biggest market capitalization in America, took a bit more than 15 years of existence and less than a decade as a public company. Not too shabby, Google. The new king of all media just supplanted Exxon Mobil, an ancient conglomerate with multiples of its revenue, earnings, and assets, for the No. 2 slot; Apple remains on top. The Mountain View, CA, company totes at least $59 billion in cash and has had a hand in 127 deals totaling a little less than $18 billion in the past three years, according to Bloomberg data. In the past two months alone, Google has taken out digital-thermostat maker Nest Labs for $3.2 billion and robotics shop Boston Dynamics. Last year, Google's venture arm led a $360 million investment in Uber, the car-booking app everyone is talking about.