A wall of security cameras in Toronto, Canada

Are Smart Cities a Wise Idea?

When Google runs a smart city, who owns the data?
A large tree with moss-covered roots.

How Trees Can Save Lakes From Algae Blooms

In addition to cleaning air pollution, trees absorb excess nutrients from soil, preventing algae blooms in waterways.
A person saving a parking spot by laying down on the concrete.

When Did We Start Paying to Park Our Cars?

A Curious Reader asks: When and why did parking become monetized?
Los Angeles

Why Is It So Much Hotter in the City?

On a sunny day, a city can be several degrees warmer than the surrounding countryside. Could better building materials make cities absorb less heat?

Buzzing In at the “Bee & Bee”

City gardens and hotel rooftops can serve as refuges—and food corridors—for the troubled species.
A flood in St Mark's Square in Venice

Our Sinking Cities

From Venice to Tehran to Shanghai, many cities are steadily sinking into the earth. There might not be any way to stop it.
The Knightscope K5 Security Robot

Do Security Robots Signal the Death of Public Space?

A security robot targets the homeless, raising questions about whether private companies can expand their security detail to public spaces like sidewalks.
Side-by-side image of Dubai and Manhattan

The Key to Environmentally-Friendly Urban Planning

Manhattan and Dubai are both bustling, crowded cities with dense populations. So do Manhattanites have smaller ecological footprints?