In terms of moral principles being testable and confirmable like scientific principles, the answer is that they cannot be tested as scientific principles.
Moral principles are subjective which means that they cannot be tested like scientific principles in that different people might have different principles which may conflict with each other.
Scientific principles on the other hand, are objective and apply regardless of person.
In conclusion, moral principles cannot be tested as scientific principles.
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Whites and free blacks from the North were most often the teachers in Freedmen's Bureau schools.
Freedmen's Bureau was a sort of a shelter from former slaves who had nowhere else to go to. They could come to the Bureau and stay there, get some food and clothing, and later, even education. Schools were opened in the Bureau, and many white people from the North (as well as educated black former slaves) came here to educate them.
The answer in both statements are true. It is because an interest party is someone who likely stands to gain as this is a type of individual who awaits to gain something or to acquire something. While the disinterested party is no or little stake because he or she doesn't want to be involved or to gain something.