We get support from UC Davis, a globally ranked university, working to solve the world's most pressing problems in food, energy, health, education, and the environment.

UC Davis researchers collaborate and innovate in California and around the globe to find transformational solutions.

It's all part of the university's mission to promote quality of life for all living things.

Find out more at 21stCentury.ucdavis.edu

This is 99% Invisible. I'm Roman Mars.

I'm not one of those people who romanticize as the edgier, grittier New York, but this park has been overrun with dogs and babies.

And this is my friend Benjamin Walker reporting from New York City's Tomkin Square Park.

The first Tomkin Square riot took place in 1857. A bunch of unemployed immigrants tried to set the park on fire.

And then in 1863, the park saw more trouble when the ultra-violent draft riots engulfed the city.

But it was the riot of 1874 that made Tomkin Square Park famous.

Over 7,000 workers battled 1,600 police officers, some on horseback swinging clubs.

Early labor organizers Samuel Gompers described the riot as an orgy of brutality.

In 1936, Robert Moses redesigned the park.

He cut it into sections. And supposedly, he believes his design was riot proof.

Well, I guess what we know about that is it didn't work.

Fish on Chakrabardi is a professor of architecture and design at Columbia University.

In the late 80s, he had a girlfriend who lived near Tomkin Square Park.

So he experienced the riots of 1988 first hand.

It was pretty extraordinary actually.

You didn't wander around here too much at nighttime.

Once again, activists battled it out with cops on horseback.

But the difference with this riot is you can watch it on YouTube.

...