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After returning to the United States, Kerry joined the Vietnam Veterans Against the War (VVAW). Then numbering about 20,000, VVAW was considered by some (including the administration of President Richard Nixon) to be an effective, if controversial, component of the antiwar movement. Kerry participated in the "Winter Soldier Investigation" conducted by VVAW of U.S. atrocities in Vietnam, and he appears in a film by that name that documents the investigation. According to Nixon Secretary of Defense Melvin Laird, "I didn't approve of what he did, but I understood the protesters quite well", and he declined two requests from the Navy to court martial Reserve Lieutenant Kerry over his antiwar activity.

How many members did VVAW have when Kerry joined it?
Answer: about 20,000
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Professional wrestling (colloquially abbreviated to pro wrestling or wrestling) is an athletic form of entertainment based on a portrayal of a combat sport. Taking the form of live events held by touring promotions, it portrays a unique style of combat based on a combination of adopted styles, which include classical wrestling, catch wrestling and various forms of martial arts, as well as an innovative style based on grappling (holds/throws), striking, and aerialism. Various forms of weaponry are sometimes used.

What is professional wrestling abbreviated as?
Answer: pro wrestling
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On the other hand, changes through the Phanerozoic correlate much better with the hyperbolic model (widely used in population biology, demography and macrosociology, as well as fossil biodiversity) than with exponential and logistic models. The latter models imply that changes in diversity are guided by a first-order positive feedback (more ancestors, more descendants) and/or a negative feedback arising from resource limitation. Hyperbolic model implies a second-order positive feedback. The hyperbolic pattern of the world population growth arises from a second-order positive feedback between the population size and the rate of technological growth. The hyperbolic character of biodiversity growth can be similarly accounted for by a feedback between diversity and community structure complexity. The similarity between the curves of biodiversity and human population probably comes from the fact that both are derived from the interference of the hyperbolic trend with cyclical and stochastic dynamics.

What model implies a second-order positive feedback?
Answer:
Hyperbolic model