input question: What should I do once the copper pipe solder has cooled down when working on a plumbing project?

output answer: grab a rag and wipe the excess flux off as good measure and test your joints by turning the water back on.

input question: To find the center of a coin, you can

output answer: Use a ruler

input question: Hide wires under office table.

output answer:
Use desk curtain to mask wires.