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riddle of the day

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It was bi-metal that gave it away to me. That's how thermocouples work, energy (a flame) heats the bi-metal strip and that generates a dc current, which is used to hold open an electro-mechanical valve. If the flame goes out, you lose the needed voltage to hold the pilot valve open so it closes the valve under spring pressure.

But I have no clue what a quark is. Never heard the term before.
 
Oh I have one, lol.

What does light make, when it's congealed?

I guess this is more trivia than riddle lol.
 
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