Comment by graypegg

It would be an interesting website if formatted like wikidata. Anyone can make/edit a magnitude, and the goal for moderation is keeping like-items in a context comparable. (Stadium Attendance has at least some commonality with Stadium Size)

You'd end up with this big graph of values, that in theory you could traverse as deep as you want by just using the right units and multiplying. "[1-person's joules burned per hour by standing] x [1-standium's worth of people] x [4-football game's length in hours]"