In 1826, John Walker noticed a dried lump on the end of a stick while he was stirring a mix of chemicals. When he tried to scrape it off, voila, sparks and flame.
Penicillin
Staphylococcus bacteria was left uncovered; and Sir Alexander Fleming noticed that mold on the culture had killed many of the bacteria. He identified the mold as penicillium notatum
Percy Spencer an engineer at the company, was working on a magnetron when he noticed that a candy bar in his pocket had started to melt due to the microwaves.
Plastic
Although earlier plastics had relied on organic material, the first fully synthetic plastic was invented in 1907 when Leo Hendrik Baekeland accidentally created Bakelite.
X-ray
In 1895, German physicist Wilhelm Conrad Röntgen was tinkering with a tube of cathode rays, the phosphorescent stream of electrons
At the time, the soda fountain was rising in popularity as a social gathering spot. Temperance was keeping patrons out of bars, so making a soda-fountain drink just made sense by John Pemberton.
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