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The rate of assaults on American law enforcement reached a 10-year high in 2023, with more than 79,000 officer attacks reported, according to a new FBI report released Tuesday. The report analyzes ...
These account for about 30% of gamma-ray bursts, but until 2005, no afterglow had been successfully detected from any short event and little was known about their origins. Since then, several dozen short gamma-ray burst afterglows have been detected and localized, several of which are associated with regions of little or no star formation, such ...
The Dow did not get off to a good start, plunging 30% to an all-time low of 28.48 by August that year. Dow 100: The Dow first closed in triple digits in January 1906.
The angle of incidence, in geometric optics, is the angle between a ray incident on a surface and the line perpendicular (at 90 degree angle) to the surface at the point of incidence, called the normal. The ray can be formed by any waves, such as optical, acoustic, microwave, and X-ray. In the figure below, the line representing a ray makes an ...