This may seem like a classic answer, but I think that it answers quite well the question:
Sciene tells us what IS. Humanities tells us what OUGHT TO BE.
I think the first part is farely obvious. Science will tell us if I am alive or not. Humanities will tell us if I should be alive or not. (example: I just killed 20 people in a bus. Science won't be able to say if I should be executed or kept alive. Humanities will)
This aspect of science and humanities as been extensively looked into by every notable philosophers of science since Karl Popper.
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