A fifth-grader in Kansas City clicked ball-and-stick atoms together in science class and asked her teacher if she'd made a real molecule — he photographed it, sent it to a chemistry professor, and at ten years old she became co-author of a published paper on a structure nobody had ever described

The lesson at Border Star Montessori School in Kansas City, Missouri was as routine as chemistry teaching gets. Kenneth Boehr handed his fifth-graders the ball-and-stick modeling kits, the colored spheres and connecting rods every science classroom owns, and set them to building simple molecules: water, carbon dioxide, the standards.

Ten-year-old Clara Lazen did not build a standard. She clicked together a dense, symmetrical cluster of black carbon, red oxygen and blue nitrogen, carried it up to Boehr’s desk, and asked the question that started everything: was this a real molecule, or not?

Boehr looked at it and realized he had no idea.

Phone a friend

What Boehr did next is the whole story, because the ordinary move, that’s nice, Clara, back to your seat, would have ended it. Instead he took a photo of the model with his cell phone and sent it to an old college friend, Robert Zoellner, a professor of computational chemistry at Humboldt State University in California, whose specialty is using software to model whether molecules can exist and how they would behave.

Zoellner later said that with most such pictures he can tell at a glance whether the structure is real, known or nonsense. Clara’s made him stop. He ran it against the chemical databases that catalogue every published compound and found that the formula matched exactly one known substance, but with the atoms arranged differently, and an arrangement no one had ever described. The girl had assembled a genuinely novel structure: a central carbon holding four nitrate-based groups in a symmetrical cage, a compact, plausible, previously unimagined molecule.

Then his calculations turned up the detail that guaranteed headlines. The structure contains carbon, nitrogen and oxygen in the same ratios as nitroglycerin, and Zoellner’s modeling suggested the thing, if ever synthesized, could pack away serious energy, useful, he noted, for energy storage, or for a large explosion, or something in between. The molecule was dubbed tetranitratoxycarbon, and Clara, asked by reporters what her creation might be good for, replied with fifth-grade directness that she could sell it to the military for money.

Author, age ten

Zoellner did the unusual thing properly. He wrote up the analysis, a computational study predicting the molecule’s geometry, stability and possible high-energy behavior, and submitted it to the peer-reviewed journal Computational and Theoretical Chemistry, where it appeared in the January 2012 issue with three names on it: Zoellner, who did the mathematics; Boehr, who made the connection; and Clara Lazen, the ten-year-old who conceived the structure. Zoellner, deadpan, told a reporter he had never partnered with a middle-school student before, and moved the paper to the top of his list of sample publications.

The honest asterisks belong in the record, and they are mild. Tetranitratoxycarbon is, to this day, a hypothetical molecule; it exists in silicon, not in any flask, and synthesizing a cage of nitrate groups predicted to decompose with nitroglycerin-class enthusiasm is a project few labs are eager to attempt. Later computational work by other chemists has probed its stability and decomposition pathways, some of it suggesting the molecule would be less well-behaved than the first paper hoped. And accounts differ on whether Clara assembled her cluster randomly or deliberately; she said she chose an arrangement where the pieces fit and the structure looked full, which is, for what it’s worth, not a terrible description of how chemists think about stable geometry.

None of the asterisks touch the central fact: a structure no chemist had described entered the scientific literature because a child built it out of classroom toys and asked whether it was real.

The question that did the work

The story circulated worldwide, and Boehr reported the most predictable consequence: a surge of interest in chemistry at Border Star, where every kit-building lesson thereafter carried a lottery-ticket glint. Clara, for her part, took the fame lightly and drifted, as ten-year-olds are entitled to, toward new interests, telling later interviewers she was more drawn to biology and medicine.

What lasts is the anatomy of the discovery, which required no genius at any single step, only the absence of dismissal at every step. A child built something and asked a real question instead of assuming toys can’t matter. A teacher admitted he didn’t know and escalated instead of guessing. A professor took a cell-phone photo from a fifth-grade classroom seriously enough to run it through the machinery of professional chemistry. Each link cost almost nothing, and the chain ended in the permanent literature.

There is a version of this story in which Clara’s molecule is someday synthesized and does something remarkable, and a version in which it remains forever a hypothetical curiosity with an eleven-syllable name. Chemistry will decide that at its leisure. The part that is already settled is the citation, which will read the same in every database, in every future year: Zoellner, Lazen, Boehr, 2012, on a molecule first assembled, in plastic, by the youngest author, who wanted to know if it was real. It was.