Randall Munroe is the actual topic. This topic is a two episode series. This is the first episode.
Question: If all of Google's dataceters digital information was stored on punch cards...how high would the datawarehouse be?
This is an interesting question Randall Munroe investigated and published on his website. You can read about it here: https://what-if.xkcd.com/63/
Also you can find many videos on youtube which are talks by the man himself.
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