.â He trailed off. âThe possibilities are endless.â
I slumped. And what were the possibilities regarding ice?
âBut Underberg thought it was all just a dream. He was certain humanity would destroy itself before we ever had a chance to progress that far. You donât know what it was like, to live during the Cold War. I hope you guys never do. Every day people like Dr. Underberg were certain we were about to get bombed into extinction by the Russians, or vice versa. Even when I was younger, that possibility haunted us.â He sighed. âDo you remember when we went to visit Underbergâs Solar Park the other day?â
I perked up at the words. Out of the corner of my eye, I saw Eric and Savannah lean in, too.
âThere was that plaque there, with his speech from the dedication. Let me see if I have this right,â Dad said.âSomething about how the human race holds the power to bring itself into the light or into the darkness .â
â To let the sun rise or set on the face of history ,â I continued. Iâd seen that plaque a million times.
âThatâs the one.â Dad moved down to the other end of the tent, and as soon as his back was turned, Eric lobbed the head lamp into my lap.
âHey!â he whispered as I scurried up to meet him on the porch. âIsnât that what the riddle said? Something about the sun setting on the Earth?â
I nodded, surprised that heâd actually memorized it. Whatâs more, he was out here, listening to me and Dad talk instead of rushing through his chores, then beelining for his video games. I couldnât remember the last time that had happened, but I certainly wasnât going to complain.
Whatever we were looking for, we had to be on the right track. The last line of Dr. Underbergâs speech on the Solar Park plaque was about how his dream of a better future had become a reality. It sounded like he was talking about building a nice park for his hometown, but what if it was something more? What if he was talking about a battery that would help fix the environment and end wars over oil?
âJust donât let this one blow it with all her gangster talk.â Eric gestured to Savannah. â Iced? Really?â
She glared at him. âYou have a better idea?â
âHow could anything possibly beat mobsters and cryogenics?â
I giggled and she turned to me. âAre you seriously taking his side?â
âHe does have a point,â I admitted. And Iâd be more than happy to take his side now that he was finally taking mine.
âGillian, weâre following a treasure map written by a mad scientist to a model of Pluto. Nothing is off-limits.â
âOkay. You have a point, too.â I smiled at her, but she sniffed and looked away.
Eric rolled his eyes and began putting our camping supplies back in the crate, then suddenly froze. âGills,â he whispered. âItâs degrees!â
âWhat?â
He was crouched on the porch, his old compass cradled in his hand. âDegrees! Like degrees of temperature. Ice freezes at thirty-two degrees.â
The birth of ice . . . that made sense. âBut how does that help?â
He showed me the face of the compass and pointed to a ring of tiny numbers marching around the outside. âDonât you see? Directions have degrees, too. We use them in sailing. Like zero degrees is due north and one hundred eighty degrees is south.â
âSo what is thirty-two?â
âKinda north by northeast . . .â
âWait,â I said. âThatâs Fahrenheit. Wouldnât a scientist use Celsius or something? Zero is the freezing point of water in Celsius.â
âSo that would be north,â Eric said. âBy degrees.â Which led us back into northern Pennsylvania.
Savannah mumbled something.
âWhat?â I asked.
âOh, now you want my opinion?â she snapped. The
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