The document discusses the scientific principles of Pascal and Bernoulli. It explains that Pascal discovered that applying force to a confined liquid transmits the pressure change equally throughout the fluid. This principle is used in hydraulic systems, where a small force applied on a large side produces a much larger force on the smaller side. Bernoulli discovered that as the speed of a moving fluid increases, the pressure within the fluid decreases. This principle explains how the shapes of objects like airplane wings and bat wings can manipulate air pressure and airflow to provide lift.