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: When the phosphorus element - whose name means "light bringing" - was first isolated, scientists noted that it glowed in the dark and burned when exposed to air

Answer: When what element - whose name means "light bringing" - was first isolated, scientists noted that it glowed in the dark and burned when exposed to air?


Question: Force times distance is the equation for work.

Answer: Force times distance is the equation for what?


Question: When food is scarce, starving cells secrete a molecule that stimulates neighboring cells to aggregate.

Answer:
When food is scarce, starving cells secrete a molecule that stimulates neighboring cells to do what?