What’s the most famous sentence in the scientific literature?

Last week I allowed myself to vent a little about one of my writing pet peeves: the all-too-common but always incorrect construction “an unrelated genus”.  As a card-carrying nerd, I also allowed myself to segue from that into the beautiful and profound closing sentence of The Origin of Species:

There is grandeur in this view of life, with its several powers, having been originally breathed into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being, evolved.  (Darwin 1859)

 I suggested that this might be the most famous single sentence in our literature, and that raises two obvious but interesting questions.  First, is it?  And second, what are its competitors?

Monarch butterflies, and weird failures of observation

Photos: Wildlife-Friendly Garden and signage, © S Heard CC BY 4.0.  Monarch caterpillars on milkweed (in Minnesota), Courtney Celley/USFWS, CC BY 2.0.

My university, like many, is concerned with appearing green, and among its projects is a series of small plantings that offer (mostly) native plants with educational signage.  I pass by one of these every day on my walk to work: the “Wildlife-Friendly Garden”.  It has Joe Pye weed, roses, goldenrod, and a few other things, and it has some signs introducing passers-by to its “frequent visitors”.

One of the “frequent visitors”, we’re told, is the monarch butterfly: it has a lovely and informative sign.  This seems unremarkable: everyone loves monarch butterflies, everyone knows they’re common visitors to late-summer flowers like goldenrod and Joe Pye, and everyone knows they’re a species at risk* worth cherishing.  So how could I possibly have a beef with this sign?