For example, in a philosophical debate over the nature of free will, we were required to confront just how difficult it is to define what “free will” even means. We considered one definition: that a freely chosen act is one taken by someone who could have done otherwise. It felt intuitively like a good way of describing free will: if I did something, and could have done something else, then clearly I made this choice freely. But then, another philosopher pointed out, what if you chose to stay in a room all day because you wanted to, but without your knowing it the door was locked from the
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