The best thing invented since sliced bread is ___________________ And History of it.

[tapu]

The Flush Toilet

For its development history (too long to write out here), see The History of Plumbing by Hodding Carter (yes, that Hodding Carter--i wonder how many parents say, "Oh, honey, let's name the baby Hodding, whether it's a boy or a girl.")

Wiki: 2.5 billion people lack access to improved sanitation and thus must resort to open defecation or other unsanitary forms of defecation, such as public latrines or open pit latrines. Improved sanitation, including hand washing and water purification, could save the lives of 1.5 million children who die from diarrheal diseases each year.

[i have a thing about this]