the.com/precursor

The thing that shows up early so something more famous can get all the credit.

means A person or thing that comes before and paves the way for what follows — the forerunner, prototype, or early version that sets the stage.

from From Latin praecursor, 'one who runs ahead,' built from prae ('before') plus currere ('to run') — the same running root that gives us 'current' and 'course.' A precursor is literally a runner sent out front, scouting the path before the main event arrives.

etymology
Latin for runner sent ahead
chemistry use
molecule that becomes something else via reaction
symptom medicine
aura before a migraine counts as one
irony
often more interesting than what follows it
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