Human waste

The substitute was reportedly angry at a school principal who had rented the park pavilion.
Filth spreads as overused restrooms and trash bins are locked, causing public health concerns.
The broken toilet is the future frontier of prisoner abuse. Allowing an inmate to exist with a broken or dirty one is easy; the only evidence of it is the inmate's self-report, an account that will be discredited.
According to freelance journalist Rose George, a child dies from diarrhea -- usually brought on by fecal-contaminated food or water -- every 15 seconds. But human waste can be used to good purpose.