The discovery of Penicilin was a major breakthrough in medical science.
BreakThrough The Changing Face of Science in America - 1996 Science and the American Dream 1-5 was released on: USA: 8 April 1996
BreakThrough The Changing Face of Science in America - 1996 Science and the American Dream 2-5 was released on: USA: 8 April 1996
BreakThrough The Changing Face of Science in America - 1996 An Atmosphere of Change was released on: USA: 8 April 1996
It could be physical science, such as chemistry or mechanics.
BreakThrough The Changing Face of Science in America - 1996 The Path of Less Resistance was released on: USA: 8 April 1996
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BreakThrough The Changing Face of Science in America - 1996 The Path of Most Resistance 1-1 was released on: USA: 8 April 1996
observation
I can answer this the best, but probably the X-Rays they use to take pictures of your teeth. The newer (and older) Technologies they use, is considered science. Also the X-rays discovery was a breakthrough in science!
einstein
Louis Agassiz