Mechanical engineering including mechanical and chemical engineering. At its simplest, thermodynamics is the study of energy, its use and transformation through a system. Typically, engineering thermodynamics is concerned with changing energy from one form to another. As an example, automotive engines convert chemical energy (enthalpy) from the fuel into heat, and then into mechanical work that eventually turns the wheels. Thermodynamics principles are used by mechanical engineers in the fields of heat transfer, thermofluids, and energy conversion. Mechanical engineers use thermo-science to design engines and power plants, heating, ventilation, and air-conditioning (HVAC) systems, heat exchangers, heat sinks, radiators, refrigeration, insulation, and others.
Feathers: The Evolution of a Natural Miracle and how feather insulation has also been utilized by humans. "Flight" discusses how flight might have evolved in birds, interviewing Prum, Feduccia, Xu, and also ornithologist Ken Dial, who described wing-assisted incline running. In "Fancy", Hanson discusses the role of feathers in sexual selection, as well as how humans have utilized feathers for fashion, interviewing costume and fashion designers on the Las Vegas Strip and New York City. "Function" discusses how feathers have been adapted for other purposes, such as waterproofing, fly fishing, and quill pens. Hanson decided he would write "Feathers" after going on a run and noticing a