The bit about them not stretching.
Some materials will not stretch under a until a certain strain is applied ... it called Hooks law .. until you reach the elastic limit it will not stretch permanently.
Look this shit up ... http://en.wikipedia.org/wiki/Hooke%27s_law
As long as the stress doesn't reach this limit it will not stretch permanently.
@cookiesdonniedarko started
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Some materials will not stretch under a until a certain strain is applied ... it called Hooks law .. until you reach the elastic limit it will not stretch permanently.
Look this shit up ... http://en.wikipedia.org/wiki/Hooke%27s_law
As long as the stress doesn't reach this limit it will not stretch permanently.