Love Is in the N2-O2-Ar-CO2-Ne-He-CH4

Glenn Close as Mona Simpson

"Love Is in the N2-O2-Ar-CO2-Ne-He-CH4" is the thirteenth episode of the twenty-seventh season of the animated television series The Simpsons, and the 587th episode of the series overall. It aired in the United States on Fox on February 14, 2016.

This episode was dedicated to the memory of Julie Kavner's father David Kavner, who died in February 2016.

Mr. Smithers reminds Mr. Burns about Valentine's Day and tries to convince him to let the employees leave early to stay with their loved ones. Mr. Burns refuses, but Smithers convinces him to host a Sweethearts Dance. While enjoying the party with Marge Simpson, Homer Simpson gets a phone call from Grampa Abraham Simpson saying that he's alone and scared that a cat who can smell death is staring at him.

Homer and Marge decide to visit Grampa, spending the rest of Valentine's Day with him. At the Retirement Castle, a nurse gives a pill to the elders, making them hallucinate and start dancing with the ghosts of late loved ones including Mona Simpson. Marge thinks it's not fair to do that to the old folks and decides to do something about it.

Meanwhile at the party, Professor Frink is alone because he's not good in getting a girlfriend. The next day, Homer discovers him sleeping in one of the Nuclear Plant's rooms. Frink confesses that Valentine's Day is hard for people like him. Homer explains that love is a matter of trial and error. Frink gets the idea of determining what women like in a man and using science to become that person. Frink replaces his glasses with invisible blue contact lenses and uses shoe lifts for him to look taller, but even a droid that he programmed to say "yes" still thinks he's not attractive. Homer suggests it could be because of his voice, so Frink decides to use a chip under his tongue to make his voice more attractive.