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Additional resources for [Magazine] Scientific American. Vol. 297. No 6

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Cline; Scientific American, March 2003]. 2 Mini Black Holes Special relativity and quantum mechanics, the theoretical pillars of modern physics, have been connected in profound ways, but incorporating general relativity — and therefore the force of gravity— remains a work in progress. A remarkable prediction emerged in the 1970s, 3 Extra Dimensions of Space Efforts to develop such theories have led some physicists to postulate that our threedimensional universe is embedded in a space with additional dimensions.

If the satellite detects a difference, physicists will fi rst have to exclude more conventional astrophysical explanations, such as effects within the bursting stars themselves. One test will be whether the time difference increases steadily with cosmic distance; if it does, it will cast doubt on most conventional explanations. Another test will be whether the same time difference occurs for gamma rays from objects of various types, not just gamma-ray bursts but also flares generated by supermassive black holes.

HarperCollins, 2006. The First GLAST Symposium Proceedings. Edited by Steven Ritz, Peter Michelson and Charles A. Meegan. AIP Conference Proceedings, Vol. 921; August 2007. gov/glast SCIENTIFIC AMERICAN 61 BIOLOGY A LIENS among Us? ALIEN MICROBES may be hiding in plain sight. Al- though they might look like ordinary bacteria, their biochemistry could involve exotic amino acids or different elemental building blocks. 62 SCIENTIFIC AMERICAN © 20 07 SCIENTIFIC AMERIC AN, INC. December 2007 KENN BROWN Mondolithic Studios Are In pursuit of evidence that life arose on Earth more than once, scientists are searching for microbes that are radically different from all known organisms By Paul Davies he origin of life is one of the great unsolved problems of science.

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