Love
Explanation
The Joke
A scientist describes love in purely neurochemical terms — dopamine responses, oxytocin bonding, evolved pair-bonding instincts — and another character accuses them of "ruining" love by reducing it to biology. The scientist responds that understanding the mechanism doesn't diminish the experience; if anything, it's more amazing that atoms bumping into each other can produce something that feels so transcendent.
The Humor
This is one of SMBC's more philosophical comics, engaging with the "reductionism" debate that comes up whenever science explains something that people consider sacred or mysterious. The common complaint is that scientific explanation "reduces" love (or beauty, or consciousness) to "mere" chemistry. The comic pushes back on this by arguing that reductionist explanations are additive, not subtractive — knowing how a sunset works doesn't make it less beautiful.
Broader Theme
The tension between scientific reductionism and human experience is one of the deepest wells SMBC draws from. Weinersmith consistently takes the position that understanding how something works enhances rather than diminishes the wonder of that it works. This places him in the tradition of science communicators like Carl Sagan and Richard Feynman, both of whom argued that scientific knowledge deepens appreciation of nature.