This back of the napkin math is one of those things I whish more people just did. E.g. when people talk about harvesting vibrational energy on the streets or i

This back of the napkin math is one of those things I whish more people just did. E.g. when people talk about harvesting vibrational energy on the streets or in wearable electronics you should be able to do a ballpark judgment of how much energy such a technology could roughly output in an ideal world. It always amazes me how few people in finance apparently have no clue about even the most basic laws of physics when they repeatedly fund things like these.