And they did get it. Hour followed hour and day followed day from take-off to turnover, where there was no Doppler effect even though the velocity of the ship was fiercely high. The hours fled by in a working flurry of tests and experiments and almost-constant talk between the arrowing ship and Venus Equilateral.... * * * * * "It doesn't add up," complained Walt Franks. Christine looked up from her book and waited. "Something's more'n we bargained for," he said. "What?" asked Christine. "Why, that area we're chilling off is cooling far too fast." "I should think that would be an advantage," said Christine. "Maybe--and maybe not," said Walt. "The big thing is that things should behave according to rules. When they do not, then's when people make discoveries that lead to new rules." "That I don't follow," said Christine. "Well, in this case we know to several decimal places the heat equivalent of electrical energy. Three thousand, four hundred thirteen kilowatt hours equals one B.T.U.--a British Thermal Unit. We know the quantity of electrical power--the number of kilowatts--being coursed through the tubes en route to Pluto. We know by calculation just how many calories of heat there are in the area we're cooling off--and therefore we can calculate the time it will take to reduce the temperature of that area a given number of degrees centigrade. We're about double." "And--you were starting to explain something different," said Christine. "Oh--yes. Well, for a number of years--several thousand, in fact--it was taught that a heavy mass falls faster than a light mass. Then Galileo tossed rocks off of the Tower at Pisa and showed that a small stone and a large stone fall equally fast. That was a case where definitely provable evidence was at variance with the rules. They couldn't revise the actuality, so they had to revise the rules." "I see. And now because that area is cooling off much faster than anticipated, you anticipate that something is not behaving according to the rules?" "Bright girl," chuckled Walt. "Thank you, kind sir," laughed Christine. "But remember that I was raised in a bright family." "Come on," said Walt. "We're going to investigate." "In that cold room?" asked Christine with some concern. Walt nodded. "You'll get used to it," he said absently, collecting a few instruments. "Look, Walt," said Christine in a scathing tone, "I'm used to it! That's why I came to Venus Equilateral from Mars. Remember?" Walt looked at her, wondering. But Christine wore a smile that took most of the sting out of her words. "Lead on, Walt. I can take a bit of chill. In fact," she said with a half-smile, "under the proper circumstances, a bit of chill is fun."