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 21st century.

UC Davis. edu.c. dot edu

this is 99% invisible I'm Roman Mars

how to make a concrete stylus.

Take a large nail, heat the tip red-hot in a blue gas flame.

Drop it in ice water.

Now it will resist abrasion as it cuts through the sand, cement, and rock particles in concrete not yet hardened.

From the abstract to the concrete.

Signed, a friend.

I first found Nico by staring at the sidewalks.

Delphine Vigil is a journalist from San Francisco.

One of my favorite things was always to kind of get lost in San Francisco and stare at things

that I normally might have looked past and then I saw his name written in the sidewalk.

Rooko.

And I thought it was interesting and then a block later I found his name again.

I turned a corner through Chinatown into North Beach and I found another one.

You know, I would find them not just in North Beach but

Chinatown Russian Hill telegraph Hill they would be references to the street name like

...