 There is one central object that saves Casey Ritter and Pard Hoskins from the wrath of Jupiter’s scorpion race. What is it and what does it do?
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. And instead, blast me, if they didn't foul me with this trip to good old Jupiter. Jupiter was a death sentence. 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. That whole Kooleen caper: Had it been just a trap to lead me straight to this? Well, a cross between a scorpion and a grasshopper, to be accurate. "What were you trying to do, start a feud between us and Mars?" Big as hen's eggs, an even dozen of 'em; and flawless, I'm a-shoutin', not a flaw!" Those emeralds were in the inner shrine of the super-sacred, super-secret temple of the cavern-dwelling tribe of Killicuts on Mars—the real aborigines.
 A perfume that makes the scorpions fall in love with whoever wears it.
 A potion that causes the scorpions to go insane.  A yellow space suit. The scorpion race considers yellow is a sign of serious respect.  A yellow space suit. The scorpion race considers yellow a sign of romantic love.  A perfume that makes the scorpions fall in love with whoever wears it.