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I outsource world building to my players, it actually makes them care about the game world since they shape many of the decisions.
Things exist in flux until referenced by a player, as an example I asked a player to roll a knowledge check on manticores, they got a nat 20 and instead of just telling them about manticore I asked them to tell me about manticore's and what they said is now Canon.
The manticore's in my world speak in posh accents have a great appreciation for the arts and can't tell lies.