Fiction has to be plausible. All history has to do is happen.
Interview at the World Science Fiction Convention (25 June 1998)
Many things are possible. Few things are certain.Harry Turtledove
A horsefly can't do a horse much real damage, but it can drive it wild anyhow.Harry Turtledove
People you don't like are pigheaded. Your friends are stubborn, or hold to their purpose.Harry Turtledove