Undiscovered Presents: Spontaneous Generation
![](https://media.wnyc.org/i/800/0/l/85/2019/12/Swan-necked_flask_used_by_Pasteur._Wellcome_M0012521.jpg)
Swan-necked flask used by Pasteur.
( Wikimedia Commons/CC BY 4.0 )
( Wikimedia Commons/CC BY 4.0 )
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