Plastic is a word that originally meant “pliable and easily shaped.” It only recently became a name for a category of materials called polymers. The word polymer means “of many parts,” and polymers are made of long chains of molecules. Polymers abound in nature. Cellulose, the material that makes up the cell walls of plants, is a very common natural polymer.
Over the last century and a half humans have learned how to make synthetic polymers, sometimes using natural substances like cellulose, but more often using the plentiful carbon atoms provided by petroleum and other fossil fuels. Synthetic polymers are made up of long chains of atoms, arranged in repeating units, often much longer than those found in nature. It is the length of these chains, and the patterns in which they are arrayed, that make polymers strong, lightweight, and flexible. In other words, it’s what makes them so plastic.
These properties make synthetic polymers exceptionally useful, and since we learned how to create and manipulate them, polymers have become an essential part of our lives. Especially over the last 50 years plastics have saturated our world and changed the way that we live.
The First Synthetic Plastic
The first synthetic polymer was invented in 1869 by John Wesley Hyatt, who was inspired by a New York firm’s offer of $10,000 for anyone who could provide a substitute for ivory. The growing popularity of billiards had put a strain on the supply of natural ivory, obtained through the slaughter of wild elephants. By treating cellulose, derived from cotton fiber, with camphor, Hyatt discovered a plastic that could be crafted into a variety of shapes and made to imitate natural substances like tortoiseshell, horn, linen, and ivory.
This discovery was revolutionary. For the first time human manufacturing was not constrained by the limits of nature. Nature only supplied so much wood, metal, stone, bone, tusk, and horn. But now humans could create new materials. This development helped not only people but also the environment. Advertisements praised celluloid as the savior of the elephant and the tortoise. Plastics could protect the natural world from the destructive forces of human need.
The creation of new materials also helped free people from the social and economic constraints imposed by the scarcity of natural resources. Inexpensive celluloid made material wealth more widespread and obtainable.
The President that used subtle signals of support for southern whites’ resistance to racial equality was Ronald Reagan.
This is evident when in 1980, while campaigning, he claimed that he believed in "state's rights" at the NeshobaCountyFair in Philadelphia, Mississippi.
Ronald Reagan, a President from Republican Party, subtle signal later sparked the shift in southern support for the republican party.
Given the location of the NeshobaCounty Fair in Philadelphia, it was widely believed that Ronald Reagan used the infamous southern strategy to canvass votes from the conservative American or Southern white Americans.
Hence, in this case, it is concluded that the correct answer is Ronald Reagan.
Because of the difficulty of crossing the channel. An invasion of England at that time, late 1940, would have needed a massive naval force & air superioity. Hitler didnt have. Hope i helped!! Can i get brainliest please?!?
<span> A difference between the Byzantine and Roman Empire was their form of religion. In Rome, the people worshipped Jupiter as the father of all gods. Jupiter and his wife Juno had many children that were also gods. For example, Mars, the god of war was a child of Jupiter. Mercury, the messenger god was another son of Jupiter and his wife. This meant that Rome was a polytheistic society. They believed in more than one god. The Byzantine Empire, on the other hand, was a monotheistic society. This meant that they believed in only one god. They mainly followed the teachings of Christianity.</span>
They succeed in their first try at performance, which inspires them to keep performing.
<h3>What does continuous Performance entail?</h3>
Any of several different types of neuropsychological tests that gauge someone's capacity for sustained and focused attention is known as a continuous performance task, continuous performance test, or CPT. The capacity for sustained attention—the capacity to maintain a constant concentration on some ongoing task or stimuli—is linked to impulsivity. Selective attention is the capacity to pay attention to important stimuli while ignoring unimportant stimuli. This trait is connected to distractibility.
The Integrated Visual and Auditory CPT (IVA-2) is a test of attentional variables (T.O.V.A. ), and the Conners' CPT-III are the three most often utilized CPTs. These attention assessments are frequently used as a component of a battery of assessments to determine a person's "executive functioning," or their capacity to organize and manage information.
