In the late 1800s and early 1900s, many cities were facing the same issue: so much horse manure, they couldn't keep up with it. It created unhygienic conditions, and very real problems.
Learn more about advertising on the HowStuffWorks podcasts at www.howstuffworks.com/advertisers.htm
And to learn about your ad choices when listening to podcasts, visit
https://www.howstuffworks.com/privacy.htm#ad-choices
