* meters
* kg
* lean celsius but don't care too much either way
* abolish seasonal time changes
* for online calls/events specify time in UTC
* YYYY-MM-DD date format
* ground floor is 0th; don't skip 4 and 13
* don't put sugar in cold tea

Simple rules for a civilized society.

Sure, but which electric plug style are we making standard?

EVM 661 --- ITAPOMP  
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Just make the sockets accept any of the major plugs imo. Hotels are increasingly doing this already.