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In a week sondra had a notebook full of drawings and

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In a week, Sondra had a notebook full of drawings and notes about her project, fromspending hours after school researching, thinking and planning. Blue Lightning, Mark IIlooked ready to go. Sondra’s design was a lot like the original Blue Lightning, except insteadof pinewood, it would be made of steel. And of course, it would be a real vehicle that shecould drive. Thrilled at the thought of building it, Sondra brought her sketches and notes toher dad.He put on his glasses and looked over her work, thinking. “These are some interestingideas, honey,” he said. “I see you’ve designed this a lot like your Pinewood Derby car from afew years ago, even down to the lightning bolt shape you love so much.”“That’s right!” Sondra said, beaming.“Well, it will certainly look unique,” he said. “But how will it drive?”“What do you mean?” Sondra asked.“Well…” Her dad stopped to think. It seemed like he had something to say, but decidedagainst it. “Tell you what. Instead of telling you what I think, why don’t we build BlueLightning, Mark II the way you’ve designed it?”Sondra was a bit confused, but she wanted to build the go-kart more than anything, soshe agreed.They took a trip to the hardware store to buy all the parts they needed: a lot of metal,engines, cables, brackets, bolts and screws. They had to stop at a specialty hobbyist store topick up the steering wheel and the materials they needed to build the steering block—theaccelerator and brake pedals, and, of course, a comfy seat for Sondra to sit in. Finally, theystopped at a sporting goods store to buy a helmet and pads for her to wear when she wasdriving.Back at home, they brought all their new stuff into the garage and went to work. Overtwo weekends of hard work, they turned Sondra’s sketches and notes into a real, working go-kart. When they finally mounted the seat on Blue Lightning, Mark II, Sondra felt more proudthan she had ever felt in her whole life.“She looks great!” Sondra said. “All we have to do now is the paint job!”“Before we do, why don’t we take it for a test drive?” her dad said.Sondra thought she heard some mischief in his voice and thought about how he hadalmost said something about her design, but had decided not to. What was he up to?“Okay,” she said. “Let’s do it!”So they took the second Blue Lightning out to a nearby parking lot, and Sondra took itfor a spin. Her dad made sure she wore her helmet and pads, and watched her as she drovethe go-kart around the lot. She noticed that when she tried to go fast, she felt a lot ofresistance from the wind. When she slowed down, she didn’t notice it as much.After she had her fun, she drove back to where her dad was standing. He was smiling
like he expected something from her.“Well, that was fun!” she said. “But I think I know why you wanted me to take it for atest drive.”“Oh, do you?” he said. “Please share.”“I noticed that there was a lot of push-back when I would drive it fast,” she said.

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Plate Tectonics, d, Mistletoe

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