At the interface between two facets of an artificial crystal, sound waves can be transmitted in the opposite direction to that expected, and undergo no reflection. Such wave behaviour could have many ...

Proceedings of the National Academy of Sciences of the United States of America, Vol. 11, No. 8 (Aug. 15, 1925), pp. 498-502 (5 pages) ...

Current issues are now on the Chicago Journals website. Read the latest issue.Founded in 1936 by George Sarton, and re-launched by the History of Science Society in 1985, this annual thematic journal ...

This is the spectacular moment a rare sun halo shimmered in the sky in Thailand. Footage shows the iridescent circle of light ...