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i believe the answer is: psychological experiment
in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.
due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.
abu bakr, was a senior companion and—through his daughter aisha—a father-in-law of the islamic prophet muhammad. abu bakr became the first openly declared muslim outside muhammad's family. abu bakr served as a trusted advisor to muhammad.