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Perpetual motion is the motion of bodies that continues forever in an unperturbed system. A perpetual motion machine is a hypothetical machine that can do work indefinitely without an external energy source. This kind of machine is impossible, since its existence would violate the first and/or second laws of thermodynamics. [2] [3] [4] [5]
A wheeled buffalo figurine—probably a children's toy—from Magna Graecia in archaic Greece [1]. Several organisms are capable of rolling locomotion. However, true wheels and propellers—despite their utility in human vehicles—do not play a significant role in the movement of living things (with the exception of the corkscrew-like flagella of many prokaryotes).
An engraving of Robert Fludd's 1618 "water screw" perpetual motion machine. The history of perpetual motion machines dates at least back to the Middle Ages. For millennia, it was not clear whether perpetual motion devices were possible or not, but modern theories of thermodynamics have shown that they are impossible. Despite this, many attempts ...
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This is a list of infectious diseases arranged by name, along with the infectious agents that cause them, the vaccines that can prevent or cure them when they exist and their current status. Some on the list are vaccine-preventable diseases .
List of endocrine diseases; List of eponymous diseases; List of eye diseases and disorders; List of intestinal diseases; List of infectious diseases; List of human disease case fatality rates; List of notifiable diseases - diseases that should be reported to public health services, e.g., hospitals. Lists of plant diseases; List of pollution ...
Disease Discoverer 2600 BC: Malaria [1] 1900 BC: Rabies: 1600 BC: Cancer: Hippocrates: ca 300: Dengue: Jin Dynasty (266–420) 9th century: Measles: Muhammad ibn Zakariya al-Razi: 14th century: African trypanosomiasis: First described by Arab traders [2] 1798: Color blindness: John Dalton: 1798: Amyotrophic lateral sclerosis: John Dalton: 1881 ...
Alpers disease; Alpha 1-antitrypsin deficiency; Alpha-2 deficient collagen disease; Alpha-ketoglutarate dehydrogenase deficiency; Alpha-L-iduronidase deficiency; Alpha-mannosidosis; Alpha-sarcoglycanopathy; Alpha-thalassemia; Alpha thalassemia abnormal morphogenesis; Alpha-thalassemia mental retardation syndrome; Alport syndrome. Alport ...