Discuss the difference between policymaking by the courts and
policymaking by Congress.

It put Congress in charge of making laws, the president in charge of enforcing them and the Supreme Court in charge of deciding cases that arise under them, including cases in which the laws may conflict with the constitutional guarantees.

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.