Definition: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Input: Kleppner and Ramsey used a similar apparatus as this experiment to achieve population inversion in MASERS, and similar results were determined for ground-state hydrogen by Phipps and Taylor five years after this experiment. The phenomenon observed was due to torque effects causing precession in (*) dipoles which produced two spots on a photographic plate, rather than the classically predicted spread. The apparatus in this experiment consisted of a furnace of boiling silver, from which atoms were directed through a magnetic field before the silver beam split in two. FTP, identify this experiment conducted by and named for two Germans, in which the quantization of electron spin was confirmed.
Output:
Science