613: Threesome

Explain xkcd: It's 'cause you're dumb.
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Threesome
I wanted us to try finding an approximate numeric solution, but noooo.
Title text: I wanted us to try finding an approximate numeric solution, but noooo.

[edit] Explanation

The N-Body Problem in physics refers to our inability to analytically solve sets of differential equations modelling gravitational attraction between more than two bodies. In the comic, they describe a physicist's difficulty having a threesome due to his inability to find a closed-form solution. The title text suggests they should settle for a numerical solution since a closed form solution is unavailable; however, the physicist apparently refused to do so during the previous night when Megan suggested him to.

[edit] Transcript

Megan: We had a threesome last night.
Cueball: How was it?
Megan: Awkward - it was with a physicist.
Cueball: Why's that awkward?
Megan: They can't solve the three-body problem.
Cueball: Ah, yes.
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