John Snow mapped out cases of cholera during an infamous 1854 outbreak in London.
Modern London was built on top of a large number of plague pits, and the city's thirst for more space means digging won't slow down any time soon.
Sixty-six years later, the city's urban design is not so different.
It could also catch criminals, broadcast WiFi and... detect meth labs?
A "classic example of copy-pasting a first world solution in an emerging economy."
Once we all built homepages on GeoCities, the "city" turned out to be a poor metaphor for the web.
The "STD Triage" app lets you email pictures of your "intimate problem" to a panel of dermatologists.
Even the most ubiquitous technologies eventually disappear.
A new online game has a very simple goal: guess the city in a Google Street View. That's harder than it sounds, let me tell you.
Can the city become the next great start-up hub?
What could you change in your community if you just knew more about it?
"You always hear that information is power, and in this case it really is."
The city has been quietly establishing itself as a center for computer industries.
CityScan uses street-mapping technology and public records to find hidden violations.
When electricity was new, town leaders looked to "moonlight towers" to provide mass illumination.
Hard science is finally backing up centuries of aromatherapy wisdom.
They're not just for hippies anymore.
Base price: $1.3 million.