Dr. Alexander Fleming left a dirty Petri dish in the lab sink ____ he was a little lazy. During a laughing-gas roadshow, dentist Horace Wells saw that a man gashed his leg but did not feel any pain ____ he started using it for dental operations Back in 1870, Thomas Adams was experimenting with the sap from the Mexican Sapodilla tree ____ he wanted to find a substitute for rubber. Dr. Alexander Fleming found that his dirty Petri dish was covered with bacteria except in the area where there was mold ____ he went on to discover penicillin. Dentist Horace Wells started using laughing-gas for dental operations ____ he saw its anesthetic effects on a man who gashed his leg but did not feel any pain during a roadshow. Back in 1870,Thomas Adams wanted to find a substitute for rubber ____ he started experimenting with chicle, the sap from the Mexican Sapodilla tree.

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