 What convinces Casey Ritter to help the government by throwing himself into Jupiter’s Great Red Spot?
JUPITER'S JOKE By A. L. HALEY Casey Ritter, the guy who never turned down a dare, breathed a prayer to the gods of idiots and spacemen, and headed in toward the great red spot of terrible Jupiter. [Transcriber's Note: This etext was produced from Planet Stories Fall 1954. Those methane and ammonia planets, take it from me, they're the dead-end of creation, and why the Old Man ever thought them up I'll never know. It just ain't big enough for a gent of scope and talent; and the day the Solar System Customs caught me red-handed smuggling Kooleen crystals in from Mars, I knew I was in that corner, and sewed up tight. Sure, the crystals are deadly, but I was smuggling them legitimately, in a manner of speaking, for this doctor to experiment with. But—and this was the 'but' that was likely to deprive the System of my activities—even experimenting with them was illegal even if it needed to be done; also, I had promised not to rat on him before taking the job. Well, Casey Ritter may be a lot of things we won't mention, but he doesn't rat on his clients. So there I was, closeted with the ten members of the S.S. Customs Court, getting set to hear the gavel fall and the head man intone the sentence that would take me out of circulation for a long, long time. And instead, blast me, if they didn't foul me with this trip to good old Jupiter. Jupiter was a death sentence. "You've no doubt heard tales of the strange population of Jupiter," he said. How could any—" The senior judge rapped ferociously, and I skidded to a halt. We possess well-authenticated photographs of these inhabitants, and if you are prepared to visit them and in some way worm from them the secret of their anti-gravity field, the government stands ready to issue you a full pardon as well as a substantial monetary reward.
 Pats Hoskins tells him that Jupiter’s scorpion race isn’t as harmful as previously thought, which makes Casey realize how easy it would be to earn the compensation the S.S. Court’s offered him if he completed the mission.
 Pard Hoskins tells him that Jupiter’s scorpion race is rich with emeralds, which makes Casey realize how easy it would be to caper the emeralds and collect the compensation the S.S. Court’s offered him for completing the mission.  Pats Hoskins tells him that Jupiter’s scorpion race isn’t as harmful as previously thought, which makes Casey realize how easy it would be to earn the compensation the S.S. Court’s offered him if he completed the mission.  Casey wants to earn back his honor as a dare devil by successfully tricking Jupiter’s scorpion race into selling him emeralds.  Casey wants to learn more about Jupiter’s scorpion race.