Blaise Pascal's pessimism makes way for his readers' optimism, with his famous contemplative work, Pensées. High schoolers watch a short video that summarizes the historical philosopher's worldview and most popular aphorisms.

The properties of matter including buoyancy, viscosity, density, pressure, and more are explained in a video that also describes the various principles and laws that are associated with each property. 

Example of calculating energy using the First Law of Thermodynamics. [7:14]