New irrefutable evidence of real poo particles

[Dead Kid]

New laser experiment reveals how high poop particles may blast after we flush

“But frankly, people really haven't believed that there's much toilet flush aerosol for a long time. It's only in the past 10 years or so that it’s becoming more accepted.”

So far, our grasp of the physics of flush plumes remains crude. In recent years, scientists have reported high-speed video of droplets and computer simulations of the physics involved. But neither visualize nor quantify what’s happening with the tiniest of toilet particles.

What they did — Using a flushometer-powered commercial toilet, Crimaldi’s lab sought a comprehensive view of toilet plumes (sans the usual excrement). The 5-nanosecond-long laser pulses blasted every 100 milliseconds or so, somewhat like a green strobe.

The scientists measured how the shape of the plume evolved over time by snapping images of the illuminated aerosols every few seconds after flushing.
An image of Crimaldi's lab with a toilet and laser.

Each laser pulse captured by the camera provided a freeze frame of aerosols, which they could analyze with a special algorithm to sketch out the particle velocities throughout the plume.

They noticed that the plume quickly shot up and back toward the wall behind the toilet. The densest region of particles — which would likely contain the highest concentration of pathogens — surged about a foot above the toilet bowl within 5.5 seconds. Within 8 seconds of a flush, the researchers observed that particles shot up about 5 feet. “That’s in most people’s breathing zone,” Floyd says.

Aerosols continued to spread over 60 seconds. “Most people don't realize there are fine particles everywhere,” Floyd says. “It's nice to have the quick visualization.”

[Max]

This is why should put the seat down before flushing. Not getting hassled by female members of the household is a bonus.

[Dead Kid]

shed germs, butt-microbe crystals, virions from underneath their foreskin and probably flocs, spores and other goodies