(8 foot diameter)

This bed (erroneously called a “Hamburger Bed” but still awesome) is on sale via eBay (the source of the picture).  You can read a little about the bed here.  As creator of the BurgerMap, I’m considering bidding on this, however, I want to first make sure it won’t completely kill my appeal to the opposite sex (I have the sneaking suspicion that it might).  If any reader wins it, let me know so I can be appropriately jealous.

This may be one of the coolest things I’ve ever read in my life.  If you don’t have time, on of the key takeaways is this: as organisms get larger and larger, each individual cell slows down its rate of energy consumption.  As cities get larger and larger, fewer gas stations are required on a per-person basis to serve the fuel energy needs of the populace.  The same equation describes both.

Hopefully there will be more awesome city math to follow.  I’m currently trying to figure out what is a better predictor of a city’s walkability: total population or population density?  Theoretically it seems like the denser cities would obviously be more walkable, but looking at a list of the 40 most populous cities in America, it seems like size might be an even better indicator, since the most walkable ones are clustered near the top (and while size and density are correlated, it’s not perfect).