"Tonic, boy. Keeps me young and frisky. Now about that pircuit--"

"Did you ever work on Niccolò Tartaglia's puzzle about the three lovely brides, the three jealous husbands, the river and the two-passenger rowboat?"

"Yep," Grampa said. "Too easy."

Four thought a moment. "There's a modern variation with three missionaries and three cannibals. Same river, same rowboat and only one of the cannibals can row. If the cannibals outnumber the missionaries--"

"Sounds good, boy," Grampa said eagerly. "Whip it up for me."

"Okay, Grampa." Four looked at Fweep again. The translucent sphere had paused at Grampa's feet.

Grampa reached down to pat it. For an instant, his hand disappeared into Fweep, and then the alien creature rolled away. This time its path seemed crooked.

Its gelatinous form jiggled. "Hic!" it said.

As if in response, the flivver vibrated. Grampa looked querulously toward the airlock. "Flivver shouldn't shake like that. Not with the polarizer turned on."

The airlock door swung inward. Through the oval doorway walked Fred, followed closely by Junior. They were sweat-stained and weary, scintillation counters dangling heavily from their belts.

"Any luck?" Reba asked brightly.

"Do we look it?" Junior grumbled.

"Where's Joyce?" asked Fred. "Might as well get everybody in on this at once. Joyce!"

The door to his wife's room opened instantly. Behind it, Joyce was regal and slim. The pose was spoiled immediately by her avid question: "Any uranium? Radium? Thorium?"

"No," Fred said slowly, "and no other heavy metals, either. There's a few low-grade iron deposits and that's it."

"Then what makes this planet so heavy?" Reba asked.

Junior shrugged helplessly and collapsed into a chair. "Your guess is as good as anybody's."

"Then we've wasted another week on a worthless rock," Joyce complained. She turned savagely on Fred. "This was going to make us all filthy rich. We were going to find radioactives and retire to Earth like billionaires. And all we've done is 

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