Search Results: Number theory

The germ theory, which emerged in the late 19th century, demonstrated that microscopic germs caused most human infectious diseases. The germs involved included bacteria, viruses, fungi, protozoa, and prions. Louis Pasteur (1822-1895), a French...

Alabaster bas-relief detail showing the daggers of an Apkallu. Neo-Assyrian Period, 865-860 BCE. Detail of Panel at Door C (number 2), Room S, the North-West Palace at Nimrud, modern-day Iraq. (The British Museum, London)

Alabaster bas-relief detail showing the head of an Apkalllu, a protective spirit. Neo-Assyrian Period, 865-860 BCE. Detail of Panel at Door C (number 2), Room S, the North-West Palace at Nimrud, modern-day Iraq. (The British Museum, London)

Louis Pasteur's pasteurization experiment illustrates the fact that the spoilage of liquid was caused by particles in the air rather than the liquid itself. These experiments were important pieces of evidence supporting the idea of Germ Theory...

Restored studio portrait of Louis Pasteur (1822-1895), photographed by Paul Nadar.

Scanning electron microscope image of Vibrio cholerae. This is the bacterium that causes cholera.

Portrait of Robert Koch (1843-1910), published in 1907 in Les Prix Nobel.

View full lesson: http://ed.ted.com/lessons/how-a-few-scientists-transformed-the-way-we-think-about-disease-tien-nguyen This video was created with support from the U.S. Office of Research Integrity: http://ori.hhs.gov. For several...

Humanity didn't always know about the invisible viruses, bacteria, and microbes that can cause disease. But that doesn't mean we didn't come up with some truly bizarre ideas. From the four humors and miasma theory to bloodletting and trepanation...

The 'horse-rider theory' is a controversial proposal that Japan was conquered around the 4th or 5th century CE by a culture from northern Asia to whom the horse was especially important. Although archaeological evidence and genetics point...