The Second Industrial Revolution brought unity and prosperity to a once uneconomic Europe. Products such as railways, coal, iron and textiles, as well as the discovery of electricity and the use of chemicals, oil and steel, all contribute to what is called the Second Industrial Revolution. These products brought improvement and advancement to all social classes. The middle class profited greatly from the Revolution. Some were even starting to merge with the upper class due to the wealth of entrepreneurs, marriages between the upper middle class and the upper class, and so on. The schools also helped them find unity where the children of the upper class were allowed to study with the upper class elite. The substitution of steel for iron was one of the original changes made during the Second Industrial Revolution. This change made smaller, faster engines and better railroads and ships. New advances in transportation, such as the construction of many new railway lines (due to the replacement of iron with steel), have allowed all social classes to travel and be tourists. It was very popular on weekends for workers and the middle class to go to amusement parks, beaches, dance halls, or sports stadiums, where they could watch a newly organized professional sport. Discoveries in medicine and the environment improved nutrition and reduced unsanitary conditions. disease-bearing urban environments, poor water quality and inadequate wastewater removal. Urbanization is the term used to describe the population boom during this period in urban areas. During this period sanitary reforms intensified and developed ways to disinfect the dirtiest parts of Europe. Many women during this period struggled with the “woman question”.