The Blog
Short, well-sourced essays on availability, location, presence, privacy, and the everyday math of sharing where you are with the people who matter.
Where did "busy" go? A quiet history of presence, from Schedule+ to Skype to silence
When Microsoft shut down consumer Skype in May 2025, we lost more than a video-call app. We lost the green-yellow-red vocabulary that taught a generation of remote workers how to say "I'm here — but please don't" without typing a word.
How GPS actually works (and why your phone sometimes thinks you're in the river)
Four satellites, an atomic clock, the night in May 2000 when the world got ten times more accurate, and the reason your maps app drifts into the East River whenever you stand near a skyscraper.
The first hour: what 200,000 search-and-rescue cases tell us about being lost
Search area grows with the square of time. A four-minute-old location ping can shrink a search by 100×. Why minutes matter, what the data from ISRID actually says, and the privacy compromise people are forced into today.