12 PREHISTORIC MOTIVATION

12 PREHISTORIC MOTIVATION Lunar day 189 Smack in the middle of the night I couldn't sleep again. Only this time it wasn't due to the litany of things that normally prevented me from sleeping: claustrophobia, the rancid air mattress, space food making me sick. Instead I was wound up thinking about Dr. Holtz's death—and all the other mysterious things going on at Moon Base Alpha. Was Dr. Holtz losing his mind, or had he really made a great discovery? Why had Nina lied to me

about the cameras in the bathrooms? Was she trying to cover up Dr. Holtz's craziness—or something else? Was Chang still mad enough at Dr. Holtz to kill him? Why was Lars Sjoberg suddenly so desperate to get off the moon? The Sjobergs had hated MBA since they'd arrived, so why hadn't they ever tried to go home before Dr. Holtz's death? Had Patton Sjoberg—or someone else in his family— really sent me that threat? And what was Daphne doing on the computer when she was supposed to be operating the robot arm? Finally, at two in the morning, I couldn't take it anymore. In my cramped sleep pod I was starting to feel like I'd been buried alive. I slipped out, taking care not to wake my family, and headed for the gym. With everything that had happened the day before, I hadn't done my mandated two hours of exercise to keep my bones and muscles from turning to mush. In truth, missing a day probably doesn't make a difference, but it's better to be safe than sorry. Once you start slacking off, it's hard to get back in the routine. I didn't want to end up like Roddy, who hadn't done a lick of exercise in weeks. He now had the muscle tone of a bowl of pudding. Dad said there was a decent chance that when

Roddy eventually got back to earth, the increased gravity would snap his legs like toothpicks. I'd expected to have the gym to myself, but Chang Hi-Tech was there. He was working out with the resistance bands. These are the MBA equivalent of weightlifting. It was too expensive to fly several tons of weights to space—and given the low gravity, we would have needed weights six times heavier than those at an earthbound gym—so the bands had been developed instead. They're like giant rubber bands that you can electronically adjust the elasticity of. You attach them to the floor or wall, then push against them with your legs or arms. It feels the exact same as lifting free weights, only without the fear that you might accidentally drop them and crush your rib cage. I paused in the doorway. Chang had always been friendly to me and my family, but now, with murder on my mind, I found myself slightly frightened of him. The idea of being alone with anyone suddenly seemed like a bad idea. I wavered for a moment, thinking I should hurry back to my room. But Chang saw me before I could. "Hey!" he called out. "A fellow insomniac! What's keeping you

up, Dash?" "Guess I'm still freaked out about Dr. Holtz." "I hear you, pal." Chang was only wearing a tank top, revealing all the tattoos on his arms. Every time he flexed against the resistance bands, Albert Einstein and the rest of the great scientists swelled in size. "This thing's been a punch in the gut to all of us. I mean, I knew Holtz was getting on in years, but he always seemed so young; it kind of felt like he was gonna live forever. Want to do a race on the Head- to-Head?" The Head-to-Head is one of the few fun things to do at MBA. It's a virtual-reality system that hooks to any of the workout machines and simulates a race between them. It isn't quite the same thing as a real foot-or bicycle race, but since there's no other outlet for physical competition on the moon, it's quite popular. As much as I enjoy it, though, I looked for an excuse to leave. "No, thanks. You'll crush me." "I'll set it on a harder level for me." Chang gave one last flex against the resistance bands, then let them snap back to the wall. His muscles were so pumped with blood that Einstein's and Niels Bohr's heads looked ready to explode.

"I probably shouldn't...," I said. "C'mon! It'll be fun!" Chang waved for me to join him. By now, making more excuses would only seem suspicious. "Okay." "Excellent! Treadmills?" "Sure." While Chang set the Head-to-Head up, I subtly checked out the settings on his resistance bands. He'd had them set to three thousand pounds —equal to five hundred back on earth. I gave one a test flex. It didn't give an inch. I might as well have been trying to stretch concrete. "All right!" Chang called. "We are ready to rumble!" He waved gallantly to one of two treadmills. I climbed aboard. There was a belt attached to the treadmill to hold me down on it, simulating earth gravity so I could actually run. I locked it around my waist, slipped on a pair of hologoggles, and instantly found myself in Yosemite Valley, back on earth. It was a beautiful day with a bright blue, cloudless sky. In the distance Vernal Falls plunged down a sheer rock face into a cloud of mist. I couldn't see my avatar in this game; the entire race was from my point of view.

Chang materialized next to me a moment later. Unlike Roddy, he hadn't enhanced his avatar at all. It looked exactly like the real Chang. But then real- life Chang is so freakishly athletic he kind of looks like a video-game warrior anyhow. "Ready?" he asked. "Yeah." "On your marks, then." I tensed reflexively. A numeric countdown flashed over Half Dome: 3...2...1... A buzzer sounded. I sprang into action, but Chang was faster, pulling out in front right away. I didn't try to catch him, not wanting to tire myself out right off the bat. Instead I let him set the pace, following him along the wooded trail. It felt good to run in earth gravity again—or at least a simulation of it—rather than bound into the air with every step. Chang had enabled the sound options on the Head-to-Head as well, so I could hear birds chirping in the trees, water burbling in a nearby stream, and the occasional chitter of a chipmunk. The two of us could also talk to each other as we ran. Now that Chang had roped me into the race, I figured I should take advantage of the opportunity and