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

Q: Glaciers deposit their sediment when they melt.

A: When do glaciers deposit their sediment?
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Q: Vesicles are basic tools of the cell for organizing metabolism, transport, and storage of molecules.

A: What are basic tools of the cell for organizing metabolism, transport, and storage of molecules?
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Q: The long-lived isotopes require thousands of years to decay to a safe level in a nuclear reactor.

A:
How long do the long-lived isotopes require to decay to a safe level in a nuclear reactor?
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