By Christopher Cumo
The 20th century witnessed the best alterations in expertise and technological know-how that people have ever witnessed. those happened swiftly and affected this sort of large variety of individuals. Scientists, inventors, and engineers outfitted upon the good innovations of the nineteenth century to extend the succeed in of contemporary expertise - for a citizen in 1900, conversation, transportation, and agricultural used to be nonetheless essentially neighborhood actions; by way of 2000, an American citizen was once a part of an interconnected worldwide neighborhood. those advancements in technology and expertise have been additionally vital within the social and cultural adjustments of the interval. the good melancholy, the realm Wars and chilly struggle, the civil rights and women's rights pursuits - all have been drastically impacted via the quick clinical and technological developments within the universities and undefined.
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Example text
In its approach to sales, General Motors transformed the buying habits of Americans. Whereas Ford required buyers to pay in full for a Model T, General Motors pioneered the sale of cars on credit, creating in 1919 the General Motors Acceptance Corporation. Free from the need to scrape together the full price of a car, Americans could now buy cars that were otherwise beyond their means. By 1921 half of all buyers, and by 1926 three-quarters, financed the purchase of a car on credit. With the availability of credit, shoppers no longer needed to focus on buying a car for the lowest price and holding it for years.
Faced with these imperfections, the breeder must cross a variety of corn with other varieties over several generations until he achieves the right combination of advantageous traits and minimizes disadvantageous ones. The process is tedious and consumes years. In the 1970s, however, scientists learned to extract sequences of nucleotide bases from one plant or organism and to insert them into another. A period of experimentation followed, and in 1997 agrochemical company Monsanto began selling a variety of corn with genes from the bacterium Bacillus thuringiensis that code for production of a chemical toxic to the European Corn Borer, a pest of corn since the 1910s.
One scientist, typical in his opinion, recommended that farmers use a fertilizer, regardless of the brand, with nitrate for nitrogen, potash for potassium, and acid phosphate for phosphorus. To these chemicals scientists urged farmers to add calcium carbonate to reduce soil acidity. In the first years of the 20th century, the application of insecticides and fertilizers required the labor of both farmer and horse. The farmer stored insecticides as liquid in tanks, loading them on a horse-drawn wagon for application on crops or fruit trees.