It was England that was the birth place of the Industrial Revolution, mostly due to the availability of manpower and resources. The Industrial Revolution quickly spread to the US however.
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Formaldehyde can be added as a preservative to food, but it can also be produced as the result of cooking and smoking. Formaldehyde also occurs naturally in the environment. Humans and most other living organisms make small amounts as part of normal metabolic processes. Formaldehyde is also a byproduct of combustion. When burning natural gas, kerosene, gasoline, wood, or tobacco, formaldehyde is produced. Automobile exhaust is a common source of formaldehyde in our environment. Tobacco smoking in the home is another source of the chemical in the indoor environment.
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Tenochtitlán was an Aztec city that flourished between A.D. 1325 and 1521. Built on an island on Lake Texcoco, it had a system of canals and causeways that supplied the hundreds of thousands of people who lived there.
