We are currently bearing all server, publicity and maintenance costs for Physics Capsule ourselves. Any contribution you make will go towards these, help keep Physics Capsule alive, and ease things for us, letting us focus on preparing more educational content.
We are two physics teachers who started Physics Capsule because we wanted to create a trusted, accessible resource for curious readers to learn physics for free. We were not satisfied with the popular science articles around the web, nor did we think the heavily mathematical discussions on various encyclopaedia and reference sites were helpful to everyone. On Physics Capsule we draw from our passion for and knowledge of physics to write articles that balance mathematics and exposition to appeal to every type of reader, giving a precise and complete understanding of various ideas in physics while making it easy for readers to appreciate the nuances of physics that are often only brought out with mathematics. Physics Capsule is an open-source and completely transparent project.