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<blockquote>
''Das Beste, was Du wissen kannst,''<br>
''Darfst Du den Buben doch nicht sagen.''<br>
<br>
''The best that you know,''<br>
''You cannot tell the Boys.''<br>
� [[Goethe]], ''[[Goethe's Faust|Faust]]''
</blockquote>

A '''lie-to-children''' is an expression that describes a form of simplification of material for consumption by children. It is itself a simplification of certain [[concepts]] in [[philosophy of science]]. 

Because life and its aspects can be extremely difficult to understand without [[experience]], to present a full level of complexity to a student or child all at once can be overwhelming. Hence elementary explanations tend to be simple, concise, or simply "wrong" � but in a way that attempts to make the [[lesson]] more understandable. (Sometimes the lesson can be qualified, for example by claiming "this isn't technically true, but it's easier to understand".) In retrospect the first explanation may be easy to understand for its inaccuracies, but it will be replaced with a more sophisticated explanation which is closer to "the truth". This "tender introduction" concept is an important aspect of [[education]].

Such statements are not usually intended as deceptions, and may, in fact, be true to a first approximation or within certain contexts. For example [[Newtonian mechanics]], by modern standards, is factually incorrect (as it fails to take into account [[relativity]] or [[quantum mechanics]]) but it is still a valuable and useful model in many situations. One particular progression of "lies" or simplifications, each of which are debunked or unraveled as one progresses deeper into a subject (in this case, [[physics]]), runs as follows:

# [[Weight]] is constant.
#*Children in [[primary school]] learn that the weight of something doesn't change if the shape is changed.
# Weight is not a constant. What is actually constant is [[mass]].
#*In [[secondary education|secondary school]], teenagers often learn that on the moon or on Mars, an object's weight will be different, because gravity in those places is different, but the mass will stay the same. 
# Mass is not a constant, but depends on the velocity of the object, relative to the [[speed of light]] in a vacuum, which is a constant.
#*Later on, university students find out that [[relativity]] says that the mass of an object can vary depending on velocity.

The term appeared in the book ''[[The Science of Discworld]]'', co-authored and partly based on ideas created by [[Terry Pratchett]], and in ''[[Collapse in Chaos]]'' and ''[[Figments of Reality]]'', both by the other two co-authors of ''The Science of Discworld'', [[Ian Stewart (mathematician)|Ian Stewart]] and [[Jack Cohen (scientist)|Jack Cohen]].

==Related concepts and aspects==
Both cultural or religious-oriented myths ([[Santa Claus]], [[Easter Bunny]], [[Greek legend]]s, [[Davey Crockett]], [[Robin Hood]]), and emotionally loaded or complex subjects such as [[sex education]] and [[death]], are often simplified or mythologized, with the intention to prevent emotional disturbances in the children's mind.

There is also considerable debate as to the ethics of these, and the boundary where cultural transmission, protectiveness and appropriateness, become an "outright lie", and how such subjects should be approached.

==References==

* "Lies, Damned Lies, and Science Lessons", h2g2, BBC. 
* Pratchett, T., Stewart, I., and Cohen, J (1999), ''The Science of Discworld''.

==See also==

* [[Na�ve physics]]
* [[White lie]]

==External links==

* [http://www.funny.co.uk/comedy/prod_152-0091886570-The-Science-of-Discworld.html The Science of Discworld]
* [http://www.bbc.co.uk/dna/h2g2/A685055#back3 h2g2]
* [http://www.machall.com/index.php?strip_id=326 an example from machall]
* [http://c2.com/cgi/wiki?AllModelsAreWrongSomeModelsAreUseful C2: All Models Are Wrong, Some Models Are Useful]
* [http://c2.com/cgi/wiki?UsefulLie C2: Useful Lie]
* [http://c2.com/cgi/wiki?WittgensteinsLadder C2: Wittgenstein's Ladder] ([[Wittgenstein's Ladder]], from [[Ludwig Wittgenstein]])
* ''[http://c2.com/cgi/wiki?LiesMyTeacherToldMe C2: Lies My Teacher Told Me]: Everything Your American History Textbook Got Wrong'' by James W. Loewen. ISBN 0684818868

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* Adapted from the [[Wikipedia]] article, "Lie-to-children" http://en.wikipedia.org/wiki/Lie-to-children, used under the [[GNU Free Documentation License]].