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This is an activity about how to measure the interplanetary magnetic field, or IMF. Learners will act as scientists and engineers at a conference to explain their discoveries from earlier activities of the larger resource where they designed their own ways to measure the IMF. This activity should be used to illustrate how scientists and engineers working with the NASA STEREO-IMPACT mission have solved the same puzzle. This is Activity 3 in Session 3 of a larger resource, Exploring Magnetism in the Solar Wind.