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The 5th grader thought of a new name for the experiments along the "Milky Way" path, where visitors can experience the weight of the same object on different planets. After all, an object has an intrinsic mass (expressed in kg), but its weight is a force (expressed in Newtons) that depends on the mass of the planet, and the distance to its center.
The new name "Overbrug de zwaartekracht" ("bridge over gravity") was found with a little help from his father...