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Crash Course (sometimes stylized as CrashCourse) is an educational YouTube channel started by John Green and Hank Green (collectively the Green brothers), who became known on YouTube through their Vlogbrothers channel. [2] [3] [4] Crash Course was one of the hundred initial channels funded by YouTube's $100 million original channel initiative.
A 16th-century illustration of Nahuas infected with smallpox.. In epidemiology, a virgin soil epidemic is an epidemic in which populations that previously were in isolation from a pathogen are immunologically unprepared upon contact with the novel pathogen. [1]
This is an accepted version of this page This is the latest accepted revision, reviewed on 7 January 2025. American vlogger and entrepreneur (born 1980) This article is about the American vlogger and entrepreneur. For other people named Henry or Hank Green, see Henry Green (disambiguation). Hank Green Green in 2023 Born William Henry Green II (1980-05-05) May 5, 1980 (age 44) Birmingham ...
Agriculture encompasses crop and livestock production, aquaculture, and forestry for food and non-food products. [1] Agriculture was a key factor in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that enabled people to live in the cities. While humans started gathering grains at least ...
Crash Course is an educational YouTube channel providing many courses of study, often based around the AP curriculum of a given subject. The level of study matches that of high school or early college, but the content is available for all ages. Many courses are co-produced with PBS Digital Studios.
The president of the Soviet Agriculture Academy, Nikolai Vavilov, who had been Lysenko's mentor, but later denounced him, was sent to prison and died there, while Soviet genetics research was effectively destroyed. Research and teaching in the fields of neurophysiology, cell biology, and many other biological disciplines were harmed or banned.
Slash-and-burn agriculture is a farming method that involves the cutting and burning of plants in a forest or woodland to create a field called a swidden. The method begins by cutting down the trees and woody plants in an area.
Agricultural science (or agriscience for short [1]) is a broad multidisciplinary field of biology that encompasses the parts of exact, natural, economic and social sciences that are used in the practice and understanding of agriculture. Professionals of the agricultural science are called agricultural scientists or agriculturists.