Good afternoon: Today's PM — edited by Axios' Justin Green — is 492 words, a 2 minute read.
Situational awareness: Facebook CEO Mark Zuckerberg will meet with lawmakers on Capitol Hill tomorrow — his first time in Washington since he testified before Congress last year, sources tell Axios.
Here's a wild ride: Axios' Kim Hart and Lazaro Gamio mapped the biggest cities in America over time, starting in 1790 and running through 2017.
The big picture: Cities that were major economic hubs during the last century — primarily in the Northeast and Midwest — are struggling to hold on to population.
Between the lines: The biggest blue circles on the map didn't change between 2010 and 2017, but their populations shrank across the board — an indication of people moving to less-expensive places, to suburbs or in pursuit of jobs in up-and-coming areas.
The bottom line: Regions are competing fiercely for the jobs and talent to fuel economic survival in the era of automation. But the uncertainty around that growth complicates long-term infrastructure investment decisions.
Go deeper: Click here to use the interactive.
Climate strike leader Greta Thunberg testifies during a House joint hearing today.
Merriam-Webster has added the use of the word "they" as a singular, nonbinary pronoun.
Merriam-Webster uses the word in a sentence as an example:
"I knew certain things about … the person I was interviewing. … They had adopted their gender-neutral name a few years ago, when they began to consciously identify as nonbinary — that is, neither male nor female. They were in their late 20s, working as an event planner, applying to graduate school."