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Far-out Pathways to Space
This is a set of six web pages, authored and curated by David P. Stern, describing four unconventional methods of accelerating spacecraft. These are using cannons, nuclear power, solar sails and ion rockets....
This web page, authored and curated by David P. Stern, outlines the math and applications of parallax. Parallax is the shift in the apparent direction to an object when it is viewed from two separated locations. It...
The Round Earth and Christopher Columbus
This web page, created by David P. Stern, describes observations that show the earth is a sphere and the history of these observations. The round shape of the Earth may be inferred from the existence of a horizon at...
The Motion Mountain Physics Textbook
This is a freely downloadable physics textbook exploring mechanics, thermodynamics, electromagnetism, special and general relativity, quantum theory, and modern unification attempts. The central theme is the importance...
Work Performed Against an Electric Force
This page, authored and curated by David P. Stern, illustrates the concept of work against an electric force using the examples of the Van de Graaff generator and lightening. There are also shorter examples of the Xerox...
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