Lithium-ion batteries power the iPhone (among other things), but what if we could use a different power source like coal or diesel? With some back-of-the-napkin math, Jon Keegan for the Wall Street Journal imagines what if. It’s all about the body fat-powered iPhone with nine days of battery life.
Imagining alternative iPhone power sources
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Where Bars Outnumber Grocery Stores
A closer look at the age old question of where there are more bars than grocery stores, and vice versa.