Category: Today I learned

Tonic Immobility

Listened https://www.nationalgeographic.com/podcasts/article/bonus-episode-the-secret-culture-of-killer-whales from National Geographic

Photographer Brian Skerry swims with killer whales and discovers these apex predators have unique cultures that aren’t that different from our own.

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!  

Reimann Hypothesis

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.

Ephemeral devices

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…