The Clock Nobody Wound

The note on the door said: Dr. Khatri regrets. Family emergency. Workshop cancelled. See you next Saturday.

Maya tried the handle anyway. It was unlocked.

"We're not supposed to," Soren said, but he was already following her in, because the lab smelled like vinegar and something sharper, and the tables were already set up. Eight stations, each with a row of beakers, premeasured liquids in squeeze bottles, and a laminated instruction card.

"She set everything up before she left," Maya said. "It would be a waste."

"That's not actually a reason."

"It's a little bit of a reason."

Soren picked up the instruction card at station one. The title read: THE IODINE CLOCK. Beneath it, three steps. Combine Solution A with Solution B. Stir. Observe.

That was it. No explanation of what would happen. Just observe.

"So we don't know what it's supposed to do," Soren said.

"Good," Maya said, and she meant it.

She poured Solution A into the large beaker. Clear. Then Solution B. Also clear. She stirred with the glass rod and they both stared at a beaker of what looked like water.

"Maybe it takes a while," Soren said.

He had started writing the time in his notebook. Nine fourteen a.m. He wrote clear.

At nine fourteen and roughly forty seconds, the liquid turned the color of midnight. Not gradually. Not fading in from the edges. The entire beaker, all at once, went so dark blue it was nearly black.

Maya actually stepped back.

"What," she said. Not a question. A reaction.

Soren wrote: dark blue. Instant.

"Okay," Maya said. "Okay. So it's a color change reaction. That's the demonstration. We were supposed to time how long it takes."

"Probably," Soren said. But he didn't close his notebook, because the liquid was dark and still and something about it felt unfinished.

At nine fifteen and approximately twenty seconds, the beaker went clear again.

Neither of them spoke.

Soren wrote the time. He did not write anything else because he did not know what to write.

"It went back," Maya said.

"I saw."

"Chemical reactions don't go back."

"Some do. Reversible reactions."

"Not like that. Not snap, snap. Not on a schedule."

The beaker turned dark blue again.

Soren checked the clock on the wall. He looked at his notebook. He looked at the beaker.

"Forty seconds," he said. "Give or take."

"Since it went clear?"

"Since it went clear."

They watched. Forty seconds later, clear. Then, forty seconds after that, dark blue. Maya pulled over a stool and sat. Soren kept writing times. Clear. Dark. Clear. Dark. Each interval holding steady, like a heartbeat.

"There's no battery in the beaker," Maya said.

"No."

"There's no motor. No computer chip. Nothing plugged into anything."

"No."

"Then what's counting?"

Soren put his pen down. He looked at the card again. Solution A contained potassium iodate. Solution B contained sodium bisulfite, starch, and something else he couldn't pronounce. Just chemicals in water.

"Maybe it's two reactions," he said slowly. "Going at different speeds."

Maya leaned forward. "Say more."

"What if one reaction uses something up, and while it's doing that, another reaction is building that same something back, but slower. So the fast one finishes first, and everything flips. Then the slow one catches up and it flips again."

"Like two people on a seesaw who weigh different amounts," Maya said.

"No. More like." Soren paused. He stared at the beaker as it blinked dark again. "More like two people filling the same bathtub. One has the faucet. One has the drain. The faucet fills it up faster than the drain empties it, so it overflows. But when it overflows, something changes. Maybe the faucet slows down, or the drain opens wider. So it empties. Then it fills again."

"And the timing comes from how fast each one works."

"From the ratio. From the concentrations. From the chemistry itself."

Maya was quiet. She was looking at the beaker the way she sometimes looked at things when her brain was somewhere the rest of her hadn't caught up to yet.

"Soren. There's no clock."

"Right."

"There's no anything. It's just molecules bumping into each other. But they're keeping time."

"I know."

"Your heart does that."

The beaker went clear.

"Your heart," she said again. "It beats at regular intervals. Nobody winds it. There's no metronome in your chest. Cells just do things to each other in a loop and the loop has a rhythm and the rhythm is you being alive."

Soren felt the back of his neck prickle. He looked down at his notebook, at the column of times, the alternating words clear and dark, clear and dark, and he felt the pulse in his own wrist against the table edge.

"A clock that builds itself out of nothing but chemistry," he said.

"Not nothing. Out of being far enough from balance. Out of not being settled." Maya said this like she was tasting the words. "If everything was in equilibrium it would just sit there. It would be done. The oscillation only happens because it's unsettled."

They looked at each other.

"The interesting part is the not being settled," Soren said.

Maya smiled. Not her quick smile. Her real one. The one that meant the world had just gotten bigger and she needed a second to stand in the new version of it.

They set up station two. Different concentrations, the card said. Maya poured. Soren timed. This one oscillated faster, every twenty-five seconds, because the ratios were different, because the chemistry made a different clock out of different amounts of the same restlessness.

Station three was slower. Almost a full minute between flips.

"We could make it do anything," Maya said. "Any rhythm. Just by changing how much."

"Dr. Khatri set these up before she knew she wouldn't be here," Soren said. "She set up eight clocks. Every one of them has been ticking in an empty room all morning."

Maya turned to look at the other five stations. The beakers sat in a row, untouched, unmixed, waiting.

"Not yet," she said, reaching for station four.

Soren uncapped his pen.