This piece from Discover looks at the iconic "invisible" things that define cities -- like Seattle's clouds, Houston's air conditioning, and L.A.'s Botox.
The article also looks at the invisible famous aspects of Chicago and Philadelphia.
"The winter curse of deep snowfalls in Chicago is due to its location on the shores of Lake Michigan. When winds from the north or northeast bring cold Arctic air over the relatively warm water above the lake, the incoming air is heated and picks up moisture. The air rises and forms clouds filled with snow, which then produce heavy showers downwind of the shore."
"Do you like your Philly cheese steaks with "whiz?" Part of the key to this creamy yellow dip are emulsifiers, which help keep all of the ingredients mixed together instead of separating out. In the case of many salad dressings, mustard is the emulsifier that keeps oil and vinegar in happy union."
FULL STORY: The Invisible Things That Give a Hometown Its Flavor

Planetizen Federal Action Tracker
A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

USGS Water Science Centers Targeted for Closure
If their work is suspended, states could lose a valuable resource for monitoring, understanding, and managing water resources.

Congress Moves to End Reconnecting Communities and Related Grants
The House Transportation and Infrastructure Committee moved to rescind funding for the Neighborhood Equity and Access program, which funds highway removals, freeway caps, transit projects, pedestrian infrastructure, and more.

Integrating Human Rights Into Energy and Extractive Sector Transitions
Why just transition efforts must move beyond economic considerations by embedding human rights principles into business practices to ensure equitable, transparent, and accountable outcomes for affected communities and workers.

Blocked, Restored, Blocked Again — Housing Funds in Legal Limbo
Since Trump took office, the administration has blocked multiple affordable housing funding streams. Here's a look at which funds have been frozen, which have been reinstated, and which are in the courts.

Mapping Groundwater Risks from Orphan Wells Across U.S. Aquifers
A new USGS study reveals that more than half of the nation’s documented orphan wells lie within aquifers supplying the vast majority of U.S. groundwater, posing widespread risks of contamination from aging, unplugged infrastructure.
Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
City of Moorpark
City of Tustin
Tyler Technologies
City of Camden Redevelopment Agency
City of Astoria
Transportation Research & Education Center (TREC) at Portland State University
Regional Transportation Commission of Southern Nevada
Toledo-Lucas County Plan Commissions