4 ms·

I always wonder with these sorts of questions if they are truly asked with naïveté. Sincerely, without judgement, do kids just ask the internet now? Do we not

• matteoraso 3y ago
  This is a fairly recent change, and not normally the sort of stuff that gets taught in school. FWIW, growing up I was taught that celsius was defined in terms of the freezing point and the boiling point of water, even though that hasn't been true since the 50s.
  • jenadine 3y ago
    It's not about how recent the change is, but how "useful" it is to people. The definition of second most people know is that it is 1/60 of a minute which is 1/60 of a hour which is 1/24 of a day. That's because people can relate to a day but not to the radiation of some atom. Edit: Unless you are a physicist, of course. Then it matters.