premise: It has been suggested that SF include only those stories which would be invalidated without their scientific content ; that fiction which concerns science , scientists , and the impact of science on humans ; that which explores alternate existences ( whether future , extraterrestrial , or only in characters ' minds ) based on facts and logical progression via scientific method and true is true and true is true and true is true and true is true and true is true .
hypothesis: Everyone agrees that SF stories can ignore facts and logic .