Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Q: Simple kind of diffusion do small hydrophobic molecules squeeze through lipid molecules.

A: What kind of diffusion do small hydrophobic molecules squeeze through lipid molecules?
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Q: Seismic waves prove the inner core it is solid.

A: What do seismic waves prove about the inner core?
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Q: Outside the nucleus are electrons located in relation to the nucleus.

A:
Where are electrons located in relation to the nucleus?
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