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Before Pasteur, people believed the doctrine of "spontaneous generation" - that life spontaneously appeared from non-living matter.
This theory was used to explain why food spoiled and how infection developed. Pasteur disproved this theory.
Pasteur provided the proof for the existence of the germ theory of disease and revolutionized the way we think about human health.
The German scientist was the first person to identify electromagnetic radiation in a wavelength that we today know as an x-ray.
The most common usage of x-rays includes detecting broken or fractured bones, heart problems, breast cancer, scoliosis, and tumors. X-ray machines are used to help save the lives of millions of people.