Emacs tip of the day: defadvice is considered 'largely obsolete' in favour of explicit advice-add:
miniblog.
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Changing how microwaves are constructed and emit power, potentially making the turntable design obsolete:
Python has always been a batteries included language, but some modules support obsolete 80s tech! There's now serious discussion of removing them:
What happens to developers specialise in a technology that has become obsolete? They tend to be very adaptable: