question:  What is the central irony at the end of the story? He ends up becoming an employee of children
context: It is an uneasy privilege then, at least sometimes, to teach my old-fashioned brand of science to these children of a new age. "It has the purpose," I told her, "of teaching the members something about commerce and industry. They manufacture simple compositions like polishing waxes and sell them from door-to-door. Some groups have built up tidy little bank accounts which are available for later educational expenses." Marjorie put back her head and laughed, and I was forced to join her, for we both recognize that my understanding and "feel" for commercial matters—if I may use that expression—is almost nonexistent. Mr. McCormack is going to put up fifty dollars to buy any raw materials wanted Back in the old Ridgeville, fifty-odd miles to the south, we had our home almost paid for, when the accident occurred. When Ridgeville moved to its present site, so, of course, did we, which meant starting mortgage payments all over again. This was to be our headquarters and factory for the summer—a roomy unused barn belonging to the parents of one of the group members, Tommy Miller. You're going to decide what to do, and if it's safe and legal and possible to do with the starting capital we have, I'll go along with it and help in any way I can. Mary McCready was a big husky redhead of twelve, with a face full of freckles and an infectious laugh, and Tommy Miller, a few months younger, was just an average, extroverted, well adjusted youngster, noisy and restless, tee-shirted and butch-barbered. The usual products, of course, with these junior achievement efforts, are chemical specialties that can be made safely and that people will buy and use without misgivings—solvent to free up rusty bolts, cleaner to remove road tar, mechanic's hand soap—that sort of thing. You're Dr. Matlack's son, aren't you?
output:  While Donald is excited about the opportunity to impart his knowledge, he becomes the employee of students who have more qualifications than he does
options:  While Donald feels insecure regarding his science background, he becomes more confident due to his experience innovating with the children  While Donald initially expresses concern about selling items door-to-door, all the customers end up coming to him and the group members  While Donald is excited about the opportunity to impart his knowledge, he becomes the employee of students who have more qualifications than he does  While Donald despises teaching, he ends up committing to more teaching-related responsibilities over the course of a school year