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Their Bionic Eyes Are Now Obsolete and Unsupported
(spectrum.ieee.org)
This is a most excellent place for technology news and articles.
they’re “vignettes”… isolated stories, but they all occur in a shared universe, so you’ll sometimes hear line-drops that vaguely reference names or events from previous (sometimes future) episodes, but they don’t ever impact the stories of the episode they’re mentioned in.
but S4-S6 have been toned-down a bit from the original BBC series after Netflix bought it.