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A tiny radioactive battery could keep your future phone running for 50 years
(www.techradar.com)
This is a most excellent place for technology news and articles.
Depends, in my country ionization detectors have been banned over 20 years ago, you'll mostly find optical / photoelectric detectors here.
I wonder if its because of a valid reason, or just a precaution
It's probably safe until someone decides to go look what's inside their smoke detector