the.com/theory

the educated guess that survived every attempt to murder it.

means A well-tested explanation of how something works, built from evidence and reasoning rather than a single hunch — though in casual speech it can mean a mere guess.

from From Greek 'theōria,' meaning a looking at, viewing, or contemplation — itself from 'theōrein,' to look at or observe, related to 'theōros,' a spectator. The Greeks used it for the act of gazing intently at something to understand it, and a 'theōros' was originally an envoy sent to watch sacred games or consult an oracle. It passed through Late Latin 'theoria' into 16th-century English, where the sense narrowed from 'contemplative looking' to 'a reasoned scheme of how things work.'

not opinion
In science it means tested, not casually hunched
gravity status
Still technically a theory, yet nobody floats away
greek root
From theoria, meaning to look at or contemplate
falsifiable
A theory you cannot disprove isn't really science
everyday slip
People say theory when they mean wild hunch
for instance

darwin's theory of evolution — published 1859 in on the origin of species, explains how species adapt through natural selection

germ theory of disease — developed by pasteur and koch in 1870s-1880s, established that microorganisms cause infectious diseases

big bang theory — proposed 1927 by lemaître, describes the universe's expansion from an initial hot dense state

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