Kingdoms, pandemics and the search for a lion

“When you reap the harvest of your land, you shall not reap all the way to the corner of your field, or gather the gleanings of your harvest. You shall not pick your vineyard bare, or gather the fallen fruit of your vineyard; you shall leave them for the poor and the stranger …” 

– Leviticus 19:9-11

Humans love to sort things into categories. Biologists, being human, are no different except they get pretty serious about how they do it. The granddaddy . . .