Posts Tagged ‘consistent’

Einstein in four *spatial* dimension

Why many physicists chose to define the universe in terms of the physical properties of a time or space-time dimension instead of four *spatial* dimensions is puzzling because, as was shown in the earlier article "Defining time" Sept 20, 2007 there is no observational evidence supporting it having physical properties.  Gravity and space-time But even […]

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Time travel: is it possible?

Is time travel possible? The laws of physics in the microscopic world suggest that it is because the physical processes they define at the subatomic level appear to be either entirely or mostly time symmetric.  In other words the theoretical statements that describe them remain true if the direction of time is reversed.  However, the […]

Must we understand “nothing” to understand physics?

From Emily Conover at Science News, reviewing philosopher James Owen Weatherall’s Void: The strange physics of nothing: In Void: The Strange Physics of Nothing, physicist and philosopher James Owen Weatherall explores how physicists’ beliefs about nothingness have changed over several revolutionary periods. The void, Weatherall argues, is physics distilled to its bare essence. If physicists […]

Preferred gait and walk-run transition speeds in ostriches measured using GPS-IMU sensors [RESEARCH ARTICLE]

Monica A. Daley, Anthony J. Channon, Grant S. Nolan, and Jade Hall
The ostrich (Struthio camelus) is widely appreciated as a fast and agile bipedal athlete, and is a useful comparative bipedal model for human locomotion. Here, we used GPS-IMU sensors …

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