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Charlie watched as the camera on screen zoomed in on the plume trail behind the Challenger. And that's when she saw the plume split in two.

Charlie saw it while she heard Houston through the television, noting a major malfunction, trying to make sense of what just occurred. But Charlie knew. She knew it before the commentators said it, before the room around her even understood what they were seeing.

Charlie knew what it was before anyone spoke.

She saw the exhaust trail fork into two diverging paths and she recalled the way Frank had taught her to know what it meant when an engine sound changed pitch or a vibration shifted frequency, that something on the Challenger hadn't just malfunctioned, but had failed catastrophically. You just needed to understand thrust, and what it looked like when thrust went wrong.

The room stayed silent. Someone behind her said "Oh my God." Someone else covered their mouth. On the screen, the commentators were still trying to process what the cameras wereshowing them. But Charlie knew those seven brave people were gone. The teacher from New Hampshire was gone.

Charlie's dream that Frank Beckman had given her of human beings riding engines beyond the sky had just shown her its cost.

She didn't leave the lounge for a long time. She sat there after the others filtered out, after the television began replaying clips and commentary as no new information came in. She sat with her hand in her pocket, holding Frank's pin, and she thought about O-rings and temperature and the engineering that was supposed to prevent exactly this kind of event from happening.

In the weeks that followed, as the investigation unfolded, Charlie read every report she could find. She followed the Rogers Commission and studied the technical analysis of the solid rocket booster failure. It was the O-ring that had lost its elasticity in the cold, which meant the joint couldn't seal. Seventy-three seconds between ignition and catastrophe.

Charlie understood the physics of what had failed. What she couldn't understand waswhyit had to happen.

For months, she carried the Challenger quietly, in pieces, turning each one over in her mind the way she'd turn a component she couldn't yet place. She thought about what it meant to build something that people climbed inside of and trusted with their lives. She thought about Frank, who hadn't just maintained engines, but maintained them so pilots stayed safe, so they could stop thinking about whether the machine would hold and start thinking about where it could take them.Trust as engineering; safety as craft.

Charlie thought about the seven people who had climbed inside that shuttle and trusted the people who built it. She thought about the engineer somewhere who had looked at that O-ring data and told the managers, who likely ignored it, and she wondered what it felt like to carry that.

Charlie spent her time thinking about the Challenger disaster in a slow assembly, pieces clicking into place over weeks and months until a shape became undeniable. Charlie realized she didn't want to just build engines anymore. She wanted to build engines that didn't fail.

She wanted to be the person who caught errors everyone else may have missed, the one who looked at a system and heard the wrongness before the instruments did. But more than anything, she wanted to make sure that the people who rode machines into the sky did so in ones she'd built, and builtsafely.

Frank had given her the dream. But the Challenger had given her the mission.

In the summer of 1988,Charlie and Katie drove to Shelbyville.

It was Helen's idea. She'd been alone in the house for nearly three years, and the girls had been calling every week, sometimes twice, sometimes three times, and Helen had finally said, "If you two call me one more time this week, I'm going to start charging you for the conversation." So they drove to Indiana instead.

They stayed for ten days, sleeping in their old spots with Charlie on the sofa and Katie in the guest room. They cooked for Helen, badly, and Helen supervised from her chair at the yellow table with a bemused expression and a running commentary that made Katie laugh so hard she burned the pasta intended for Charlie's chicken piccata. Charlie never forgave her.

Two days before they were set to leave and return to California, they convinced Helen to come back with them. Helen resisted at first.

"I'm too old to be gallivanting across the country," Helen said from her seat at the table. Charlie was across from her, and Katie at the kitchen sink, finishing up with the dishes after Helen cooked for them (in which they were all grateful).

"You,old?" Katie said with a smirk. Helen threw her apron at her.

"You're not too old," Charlie said. "Besides, you still haven't seen where we live. It's really nice this time of year. I mean, the beaches are incredible. Blue water just like Frank used to talk about." Helen smiled at the mention of Frank, and Charlie could see that she was starting to win the debate.

"We'd love to show you everything we're doing out there. I could show you UCLA, Charlie could take you to Caltech's campus and show you all the buildings. It's actually really pretty there. Maybe not as nice as UCLA, but it stands a chance." This time, it was Charlie who rolled up her napkin and threw it at her sister. Katie stuck out her tongue when Charlie clearly missed. Helen laughed at the pair of them.

"Oh, girls, you know I would love that," Helen said. "I just don't know if I can handle that big of a trip. It's a lot of miles and a lot of time, and I don't know how much more of either I can add to my ol' speedometer."

Charlie grinned.

"That's a mechanic joke!"

"Well, I've been surrounded by one, if not two, for the better part of fifty years!" Helen quipped. Charlie grabbed her hand across the table and kissed it, Helen gripping her fingers tightly.

"Please, Helen," Charlie said. She could see Helen debating it in her own mind, but still teetering on the precipice, not seeing a clear landing quite yet. Then Charlie got an idea.

"What if you just come with us on the trip back? In the car?"

"In thecar?" Helen asked, her eyes going wide.

"Oh yeah!" Katie added. "We could go back altogether in the car! Motels and diner stops for meals; find random roadside attractions and see them for ourselves! Charlie! Remember how we wanted to stop and see the world's biggest ball of twine? And I mean, I know there are others, like—" Katie was heading down a rabbit hole, but Charlie loved her enthusiasm. Helen, on the other hand, looked a bit queasy.