context: There is little chance that Julius is a lion. Chances are about even that Greg is a frog. It is highly unlikely that Sandra left the milk.
hypothesis: It is certain that sandra left the milk, and Julius is a lion.
valid_hypothesis: It is impossible that sandra left the milk, and Julius is a lion.
invalid_hypothesis: It is certain that sandra left the milk, and Julius is a lion.
hypothesis_assertion: Sandra left the milk, and Julius is a lion.