Answer:
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We went through a time where most government’s around the world where monarchies. His new way of thinking challenged common thinking of the time and was later credited during and after the enlightenment where his ideas became common thinking in the modern era.
In order to build a hypothesis, Joan should take an educated guess at what the effect of adding salt to the water will be on the water's boiling point. For example, the hypothesis may be,
"The boiling point will increase".
This hypothesis is one that can be verified or rejected via experimentation. The next step for Joan would be to set up an experiment to test this hypothesis.