I'm pretty sure they are reffering to Alzheimers.
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It was a Greek astronomer called Aristarchus of Samos.
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Answer: CO alarms have a life expectancy of around seven years. The CO alarm will beep every 30 seconds or display ERR or END. If a CO alarm is at its end-of-life, replacing the battery will not stop the beep. Most detectors will beep 4 or 5 times in a row about every 4 seconds. Do not mistake dangerous levels of poisonous gas for a detector with low battery.
Explanation: (credits to the internet) Hope this helped! :D
Answer:
Mass
Explanation:
I'm not for sure but I think its Mass. Please let me know if that was right or wrong.