Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: Carried through body happens if cancer cells enter the blood stream.

Answer: What happens if cancer cells enter the blood stream?


Question: Solids are categorized by the forces holding the individual atoms, ions, or molecules together.

Answer: What is categorized by the forces holding the individual atoms, ions, or molecules together?


Question: Turbulent atmosphere does neptune's appearance change.

Answer:
Why does neptune's appearance change?