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Early fire alarms waited for the room to heat up
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The piercing alarm that warns you of a kitchen disaster used to be tragically sluggish. The earliest fire detectors patented in the 1890s didn't sense smoke at all; they waited for the actual room temperature to reach a dangerously high threshold. By the time the alarm finally decided to ring, the situation was completely out of control, making the device more of an afterthought than a savior.
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