Good news for the butterfly: Nobody affected by the storm will know WHICH butterfly caused it. Also there is a detail I don't understand: Lorenz talked about t

Good news for the butterfly: Nobody affected by the storm will know WHICH butterfly caused it. Also there is a detail I don't understand: Lorenz talked about the pressure differential underneath a butterfly's wing, being used in a large-scale weather simulation. But given the computing resources and thus the limited resolution of such simulations at the time, I wonder how big that butterfly must have been.