Online citizen science allows us to bridge the gap between researchers and nonresearchers and to improve the scientific literacy of nonresearchers. The aims of the present study were: (1) to determine whether a 5-week randomized control trial conducted by teachers in their classroom could improve 7- to 12-year-old children's inhibitory control (IC); and (2) to provide proof of concept that online scientific research projects can provide meaningful results in the context of education. As expected, children in the IC training group improved their IC efficiency to a greater extent than children in the control training group. We provide the first evidence that such online scientific research projects can be effective in improving children's IC abilities and bridge the gap between the lab and the classroom.