smoke detectors

Smoke detectors were used in the first ever space station, Skylab.  They were invented to warn scientists of fires. You can only imagine the chaos that would ensue if a fire broke out in a confined space station.  There was risk of fire from experimenting with possibly hazardous materials.  :  One of the most important devices is the smoke detector, because it has saved so many lives.  A smoke detector is a device that you hang on your ceilings or walls.  When the sensors detect smoke, it makes a loud screeching sound to warn you that there is a fire and you should evacuate. The smoke detector is so important to modern life that is illegal to not own one.
iRobotpackbot 
The iRobot packbot aqs based off  of the early mars rover testbed the rocky-7.It is now used as a robot capaball of high risk operations over 300 of them are deployed in Afghanastan and Iraq. They have a video camera for searching bunkers and caves it also can defuse explosives.


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