The Side Room

The appendix lay in the trash bin, purple and clear and shaped like a sleepy worm.

Maya stared at it.

Soren stared at the instruction card.

The surgeon, who had one sleeve rolled up and a sandwich in his other hand, pointed with his elbow.

"When the visitors come through, you press the red button for the infection storm," he said. "The bad germs rush through, everything gets flushed, very dramatic. Then you hold up the appendix and say, 'This used to be called vestigial.' Better yet, toss it in the bin. Children love tossing."

"Vestigial means leftover," Soren said.

"That is the old word," the surgeon said. "Mostly old. Sometimes useful for jokes."

Maya reached into the bin and picked up the plastic appendix. Its inside was not smooth. It was lined with tiny clear bristles, like a bottle brush made for ants.

"Why does the useless part have fur?" she asked.

The surgeon looked at his watch. "Because the engineer was fancy. Please do not lose that. Actually, do lose it for the first demonstration. I need to find the sign printer before it eats another label."

He hurried away, chewing his sandwich and muttering, "Vestigial, possibly not vestigial, definitely misspelled."

The learning lab smelled like clean plastic and warm wires. A giant transparent intestine looped across the table in front of Maya and Soren. Colored beads drifted through it in slow water, green, blue, yellow, and orange. A label said BENEFICIAL BACTERIA. Another label said DIARRHEAL ILLNESS FLUSH.

Soren read the directions again. He liked directions, especially when they were wrong in a useful way.

"Step one," he said. "Healthy gut community. Step two, press storm. Step three, add recovery beads from top funnel."

Maya tapped the top funnel. It was capped with tape.

Soren pulled the tape. The funnel stayed capped. Someone had sealed it from the inside.

"That is not a funnel," Maya said.

"It is a decorative lie," Soren said.

Maya pressed the red button.

The pump growled. Silver water surged through the clear tube. The beads shot forward in a glittering rush, clattered against a mesh drain, and vanished into a bucket underneath the table.

Then the pump quieted.

The intestine was empty.

Not mostly empty. Not nearly empty. Empty like a hallway after the bell rings and everyone has gone somewhere else.

Soren bent close to the tube. "No recovery."

"Try again," Maya said.

"There is nothing to try with. The bacteria are in the bucket."

"So the model kills the gut every time."

Soren wrote, model makes a desert, in his notebook, then looked annoyed at the sentence and crossed out desert. "Not a desert. A washed pipe."

Maya held up the purple appendix. The bristles inside caught the lab lights.

"It looks like it is meant to hold things," she said.

"Or slow things," Soren said.

They found the place where the appendix was supposed to attach. It was a small round port near the beginning of the large intestine, on a pouch marked CECUM. A rubber plug sealed it shut.

Maya pulled the plug. It made a soft pop.

"We are not supposed to rebuild the doctor’s joke," Soren said.

"It had a port," Maya said.

That was enough for both of them.

Soren dug through the supply drawer until he found a bag of extra beads. Maya fed green and blue beads into the purple appendix and shook it. Most fell right out.

"Too smooth," Soren said.

"It has bristles. Use them."

He pushed the beads deeper. This time, many snagged among the clear hairs and stayed there, packed along the little side tube.

Maya plugged the appendix into the cecum port.

It hung from the gut like a secret room.

Soren opened a binder marked MICROBIOME EXHIBIT NOTES. Half the pages were out of order. He liked that less than the sealed funnel. Maya leaned over his shoulder anyway.

"Here," he said.

The page showed a microscope picture that looked like a forest on a cave wall.

"Biofilm," Soren read. "Layers of bacteria can live in mucus and attach to surfaces. The human appendix contains immune tissue and may help maintain beneficial gut bacteria."

"May help," Maya said.

"Science says may when it is being careful," Soren said. He turned the page. "Researchers think the appendix can act like a safe house for good bacteria during diarrheal illness. After the gut is emptied, bacteria from the appendix can help repopulate it."

Maya looked at the empty clear intestine, the bucket full of stranded beads, and the small purple side room holding its green and blue.

Outside the lab, visitors were gathering. Shoes squeaked. A toddler laughed. Someone dropped a stack of pamphlets.

Soren read one more line, slower. "People without appendixes can recover more slowly from some gut infections. Not always. But populations show it."

"People can live without one," Maya said.

"Yes."

"That is not the same as useless."

"No," Soren said. "It is very much not."

For a moment the gut on the table stopped looking like a tube. The colored beads were not decorations. They were passengers, neighbors, workers too small to see without help. The purple worm was not a mistake left hanging in the body. It was off the main road, out of the flood.

Maya pressed the red button again.

The storm came hard. Water roared through the intestine. Loose beads swept away into the bucket. The appendix bounced in the current, but the beads inside its bristles held.

When the pump slowed, three green beads slipped from the purple pocket into the clear gut.

Then two blue ones.

Then another green.

Soren’s mouth opened. He did not write anything down.

"Again," he said.

They ran it again.

The same thing happened.

They ran it a third time, because Soren did not trust a thing that only happened twice.

The beads stayed through the storm. Afterward, they crept out.

Maya grinned so suddenly that Soren grinned back before he knew he was doing it.

The surgeon returned carrying a crooked stack of signs. One read VESTIGAL PARTS. Another read VESTIGIAL PARTS. A third read PARTS WE USED TO MOCK.

He stopped when he saw the appendix attached.

"I see you have rescued the worm," he said.

"It rescued the model," Maya said.

Soren pointed at the tube. "If all the good bacteria are in the main intestine, the flush removes them. If some are in the appendix, they are protected. Then they can come back out. The funnel was fake, so the gut needed its own source."

The surgeon set down the signs.

"Appendixes can become inflamed," he said. "When they do, they can be dangerous. I remove sick ones."

"Sick does not mean useless," Maya said.

The surgeon looked at the purple pocket. A green bead slid from it and rolled into the gut.

"No," he said. "It does not."

The first group of visitors pressed against the glass doors. The surgeon glanced at them, then at the trash bin, then at the sign that said PARTS WE USED TO MOCK.

"You two run this station," he said. "I will stand over there and try not to say anything outdated."

"Can we change the sign?" Soren asked.

"Please," the surgeon said.

Maya flipped the sign over. Soren handed her a marker. She wrote four words in thick black letters.

A SIDE ROOM FOR LIFE.

The doors opened.

Children crowded around the table. Parents leaned over shoulders. The surgeon folded his arms and kept quiet with visible effort.

Maya did not start with the appendix in the trash. She started with the storm.

"Watch what gets washed away," she said.

Soren pressed the red button.

The silver water rushed through the intestine and carried the bright beads into the bucket. Several children made the sound people make when a wave knocks down a sandcastle.

Maya pointed to the purple pouch.

"Now watch what did not go with it," she said.

The room got quieter.

Inside the little appendix, beads clung in the bristles.

One green bead trembled, loosened, and rolled into the empty gut.