A truck dumping biosolids in Geneva, Illinois

Waste Not, Want Not

Sewage is a vital part of a circular economy—and we have the tech to make good use of it. Why don’t we?
A pile of manure for fertilizing crops

A History of Human Waste as Fertilizer

In eighteenth century Japan, human excrement played a vital role in agriculture. Can similar solutions help manage waste today?
Vespasian

The Rise and Fall of Pay Toilets

Vespasian's most useful contribution to history may well have been creation of pay toilets.