Overheard at NatGeo recently produced a great podcast on Orcas and I learnt about Tonic Immobility. Shasta was watching Octonauts and guess which episode she ends up watching? - The one in which they talk about TI. Now that’s some coincidence!
This is fascinating! A few GPS devices apparently had a mild(?) path offset issue few days ago: The issue has to do with the ephemeris data file, also called the EPO file (Extended Prediction Orbit) or Connected Predictive Ephemeris (CPE). Or simply the satellite pre-cache file. That’s the file that’s delivered to your device on a frequent basis (usually every few days). This file is what makes your watch near-instantly find GPS satellites when you go outside. It’s basically a cheat-sheet of where the satellites are for the next few days, or up to a week or so. ...
I wouldn’t say I understood all of it, but this video from Quanta Magazine is one of the best explanations I’ve seen so far that attempts to connect prime numbers with the Reimann Hypothesis.