(Above) A swannecked flask is pictured with broth and no bacteria in it after being boiled to remove any germs or microorganisms. (Below) Another swannecked flask is pictured with outside contaminants in the air allowed in. This broth grows microorganisms.
Figure used with permission of the copyright holder: http://commons.wikimedia.org/wiki/File:Experiment_Pasteur_English.jpg
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