The industrial revolution led to new technological advances in transportation and industry. Steam power revolutionized water and land transportation in the early 1800s. A second industrial revolution from 1850 was built on electricity, steel, and oil. These new technologies further transformed industry and society. Scientific advancement also increased during this time, with discoveries in fields like biology, physics, and medicine. New social sciences also emerged to study society, economics, and human behavior. Major thinkers like Darwin, Marx, and Engels influenced scientific and political thought with their studies of natural selection, capitalism, and socialism.