Jerry Greenfield

Ben & Jerry's is an indulgent dessert that should be eaten in moderation. You should not be replacing more than one meal a day with ice cream. We do not consider a pint or a tub of ice cream to be a single serving.

The historical novelist has to consider what has actually happened, while the SF writer is dealing in possibilities, but they are both in the business of imagining a world unlike our own and yet connected to it.