One serious answer is the work of https://en.wikipedia.org/wiki/Allan_Savory https://en.wikipedia.org/wiki/Allan_Savory There are claims it's all bullshit (ahe

One serious answer is the work of https://en.wikipedia.org/wiki/Allan_Savory https://en.wikipedia.org/wiki/Allan_Savory There are claims it's all bullshit (ahem); I wouldn't automatically trust either side.