context: A group of people prepare hot air balloons for takeoff.
hypothesis: There is almost no chance that there are hot air balloons on the ground and air.
valid_hypothesis: There is a better than even chance that there are hot air balloons on the ground and air.
invalid_hypothesis: There is almost no chance that there are hot air balloons on the ground and air.
hypothesis_assertion: There are hot air balloons on the ground and air.