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The experimental system. (A) Materials needed include a timer, marbles, two plastic containers, and a blindfold. (B–D) Photographs depicting a student performing one 10-s “run” of the exercise. (B) Finding a marble in the “substrate” container. (C) Transferring a marble to the “product” container. (D) Releasing the marble into the “product” container. The 13-s video of the student performing the exercise is available (see Supplemental Material).
