Google made an extra $8 billion last quarter but won't say how. I have some guesses.

Source: Business Insider

Google reported an $8 billion gain on a company it's invested in. But which one?Vuk Valcic/SOPA Images/LightRocket via Getty ImagesImagine making an extra $8 billion and not really caring about it. That's Google, right now: The company says the value of one of its investments increased by $8 billion this quarter, but won't say which one.