From tub to toilet to toothpaste, here's everything you ever wanted to know about the most used and least discussed room in the house. From the first home bathrooms in ancient India, Roman latrines, and bizarre Victorian-era bath contraptions, to modern luxurious master bathroom suites, we trace the history of bathing, showering, and oral hygiene. And we reveal the messy truth about what was used before toilet paper–brainchild of the Scott Brothers of Philadelphia–and why astronauts wear diapers.