context: We doubt that Bernhard is a rhino. It is probably the case that Greg is green. We believe that Bill left the milk.
hypothesis: It is highly unlikely that greg is green, and Bill left the milk.
valid_hypothesis: Chances are about even that greg is green, and Bill left the milk.
invalid_hypothesis: It is highly unlikely that greg is green, and Bill left the milk.
hypothesis_assertion: Greg is green, and Bill left the milk.