From the International Institute of Social History this is "Develop physical education activities in peasant villages" a Chinese political propaganda poster by the Huxian peasant painters collective, Zhao Kunhan, 1975.

View pictures, descriptions, and dates of rockets throughout history. Learn about rockets and how they have evolved throughout time.

After a brief introduction, this site provides information on special relativity include sections such as The Michelson-Morley Experiment, The Postulates of Special Relativity, Lorentz Transformations, The Twin Paradox, Energy is...

This interactive map helps illuminate the relationships among the various composers as well as connections between music and its historical and cultural context. It also illustrates the importance of the physical and cultural...

This wall map of Iran from the Perry-Castaneda Collection is comprised of seven individual maps showing many aspects of Iran. Clicking on the individual map will enlarge it for your perusal. You can also click on the text to see a brief...

This lesson describes how physics has developed throughout history and how it helps describe the world around us. It is 4 of 6 in the series titled "What is Physics?"

Set of six maps of North and South Vietnam.

This lesson describes how physics has developed throughout history and how it helps describe the world around us. It is 6 of 6 in the series titled "What is Physics?"

Benjamin Franklin (January 17, 1706 - April 17, 1790) was one of the Founding Fathers of the United States of America. A noted polymath, Franklin was a leading author and printer, satirist, political theorist, politician, scientist,...

Lengthy biography of Euler that sets him in relationship with his contemporaries in mathematics and physics. Several quotes and pictures available, as well as links to relevant mathematical topics. A terrific site.

A very lengthy page from friesian.com discussing Bohr's theory of electronic energy levels and the explanation of commonly observed atomic emission line spectra. The concept of a photon and Einstein's observation of the photoelectric...

A very lengthy page from friesian.com discussing Bohr's theory of electronic energy levels and the explanation of commonly observed atomic emission line spectra. The concept of a photon and Einstein's observation of the photoelectric...

A very lengthy page from friesian.com discussing Bohr's theory of electronic energy levels and the explanation of commonly observed atomic emission line spectra. The concept of a photon and Einstein's observation of the photoelectric...

A very lengthy page from friesian.com discussing Bohr's theory of electronic energy levels and the explanation of commonly observed atomic emission line spectra. The concept of a photon and Einstein's observation of the photoelectric...

A very lengthy page from friesian.com discussing Bohr's theory of electronic energy levels and the explanation of commonly observed atomic emission line spectra. The concept of a photon and Einstein's observation of the photoelectric...

A very lengthy page from friesian.com discussing Bohr's theory of electronic energy levels and the explanation of commonly observed atomic emission line spectra. The concept of a photon and Einstein's observation of the photoelectric...

A very lengthy page from friesian.com discussing Bohr's theory of electronic energy levels and the explanation of commonly observed atomic emission line spectra. The concept of a photon and Einstein's observation of the photoelectric...

A very lengthy page from friesian.com discussing Bohr's theory of electronic energy levels and the explanation of commonly observed atomic emission line spectra. The concept of a photon and Einstein's observation of the photoelectric...

A commercial site giving information on the physical properties and history of emeralds. Includes details on the cuts and valuation of these gems.

A commercial site giving information on the physical properties and history of emeralds. Includes details on the cuts and valuation of these gems.

A commercial site giving information on the physical properties and history of emeralds. Includes details on the cuts and valuation of these gems.

" North China includes the densely populated and intensively cultivated North China Plain, the loess-covered uplands of Shansi, northern Shensi, and eastern Kansu, and the sparsely populated, semiarid steppes of Inner Mongolia....

A brief physical description of emeralds from an online database about minerals. Provides information about history, characteristics, color, and use.

This commercial site contains information about the sapphire's physical properties and where it can be found. Also discusses the history and romance related to the stone and includes a description of its quality.