# Sturgeon's law

Sturgeon's law (or Sturgeon's revelation) is an adage stating "ninety percent of everything is crap". It was coined by Theodore Sturgeon, an American science fiction author and critic, and was inspired by his observation that, while science fiction was often derided for its low quality by critics, most work in other fields was low-quality too, and so science fiction was no different.

## Development

Sturgeon deemed Sturgeon's law to mean "nothing is always absolutely so". This adage previously appeared in his story "The Claustrophile" in a 1956 issue of Galaxy.
The second adage, variously rendered as "ninety percent of everything is crud" or "ninety percent of everything is crap", was published as "Sturgeon's Revelation" in his book review column for Venture in 1957. However, almost all modern uses of the term Sturgeon's law refer to the second, including the definition listed in the Oxford English Dictionary.
According to science fiction author William Tenn, Sturgeon first expressed his law circa 1951, at a talk at New York University attended by Tenn. The statement was subsequently included in a talk Sturgeon gave at a 1953 Labor Day weekend session of the World Science Fiction Convention in Philadelphia.
The first written reference to the adage is in the September 1957 issue of Venture:
   And on that hangs Sturgeon’s revelation. It came to him that [science fiction] is indeed ninety-percent crud, but that also – Eureka! – ninety-percent of everything is crud. All things – cars, books, cheeses, hairstyles, people, and pins are, to the expert and discerning eye, crud, except for the acceptable tithe which we each happen to like.
The adage appears again in the March 1958 issue of Venture, where Sturgeon wrote:
   It is in this vein that I repeat Sturgeon's Revelation, which was wrung out of me after twenty years of wearying defense of science fiction against attacks of people who used the worst examples of the field for ammunition, and whose conclusion was that ninety percent of S.F. is crud.

   ### The Revelation

       Ninety percent of everything is crud.

   ### Corollary 1

       The existence of immense quantities of trash in science fiction is admitted and it is regrettable; but it is no more unnatural than the existence of trash anywhere.

   ### Corollary 2

       The best science fiction is as good as the best fiction in any field.

## Precedents and proponents

In the 1870 novel, Lothair, by Benjamin Disraeli, it is asserted that:
   Nine-tenths of existing books are nonsense, and the clever books are the refutation of that nonsense.
A similar adage appears in Rudyard Kipling's The Light That Failed, published in 1890.
   Four-fifths of everybody's work must be bad. But the remnant is worth the trouble for its own sake.
A 1946 essay Confessions of a Book Reviewer by George Orwell asserts about books:
   In much more than nine cases out of ten the only objectively truthful criticism would be "This book is worthless ..."
In 2009, a paper published in The Lancet estimated that over 85% of health and medical research is wasted.
In 2013, philosopher Daniel Dennett championed Sturgeon's law as one of his seven tools for critical thinking.
   90% of everything is crap. That is true, whether you are talking about physics, chemistry, evolutionary psychology, sociology, medicine – you name it – rock music, country western. 90% of everything is crap.