Why is the smoke detector an impor­tant invention?

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One of the most important inventions of our modern times is the smoke detector. It is able to sense when a fire occurs, because of higher levels of smoke in the home.
When this happens, it sounds an alarm that is designed to wake up that building's occupants.
George Andrew Darby invented the first true smoke detector in the early 20th century. It did not depend just on temperature, but also included some of the particulate from smoke into the sensor design for an alarm to sound.
This useful device has saved many lives, and is found in virtually every modern building around the world today.
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