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PDFtk (short for PDF Toolkit) is a toolkit for manipulating Portable Document Format (PDF) documents. [3] [4] It runs on Linux, Windows and macOS. [5] It comes in three versions: PDFtk Server (open-source command-line tool), PDFtk Free and PDFtk Pro (proprietary paid). [2] It is able to concatenate, shuffle, split and rotate PDF files.
The frequency illusion (also known as the Baader–Meinhof phenomenon) is a cognitive bias in which a person notices a specific concept, word, or product more frequently after recently becoming aware of it.
The combustion of a match is an observable occurrence, or event, and therefore a phenomenon. A phenomenon (pl.: phenomena), sometimes spelled phaenomenon, is an observable event. [1]
Lucio's phenomenon is an unusual reaction seen almost exclusively in patients from the Caribbean and Mexico with diffuse lepromatous leprosy, especially in untreated cases.. It is characterised by recurrent crops of large, sharply demarcated, ulcerative lesions, affecting mainly the lower extremities, but may generalise and become fatal as a result of secondary bacterial infection and seps
Hard rime on trees in the Black Forest of Germany. Hard rime is a white ice that forms when the water droplets in fog freeze to the outer surfaces of objects. It is often seen on trees atop mountains and ridges in winter, when low-hanging clouds cause freezing fog.
Some of the earliest work on what would become known as Fresnel diffraction was carried out by Francesco Maria Grimaldi in Italy in the 17th century. In his monograph entitled "Light", [3] Richard C. MacLaurin explains Fresnel diffraction by asking what happens when light propagates, and how that process is affected when a barrier with a slit or hole in it is interposed in the beam produced by ...
Butch Cassidy and the Sundance Kid is a 1969 American Western buddy film directed by George Roy Hill and written by William Goldman.Based loosely on fact, the film tells the story of Wild West outlaws Robert LeRoy Parker, known as Butch Cassidy (Paul Newman), and his partner Harry Longabaugh, the "Sundance Kid" (Robert Redford), who are on the run from a crack US posse after a string of train ...