Startups, a couple of hobbies I never outgrew, some thoughts, and a shelf of small projects.
Through Petrus Labs I advise and consult for startups — the main thing I do, and how I come to know the companies I end up investing in.
Latest projects
All of them →- Sep 7, 2026A Hundred LockersA hundred kids flip a hundred lockers. Work out which ones end up open, then why.
- Sep 7, 2026Don't Say 21Count to 21 one or two numbers at a time. Whoever says 21 loses — and it is decided long before anyone gets close.
- Sep 7, 2026Four People, One TorchA bridge that holds two and a torch that has to come back. Everyone across in seventeen minutes.
- Sep 7, 2026Fox, Chicken, CornA raft that holds one thing, and three things that cannot be left alone together.