Tangential speech is a communication disorder in which the train of thought of the speaker wanders and shows a lack of focus, never returning to the initial topic of the conversation.
 It is less severe than logorrhea and may be associated with the middle stage in dementia.
 It is, however, more severe than circumstantial speech in which the speaker wanders, but eventually returns to the topic.
An authored documentary is a documentary that presents the subjective view of its author on the topic of the documentary.
 In sharp contrast to observational documentaries, which are supposed to be unbiased, authored documentaries are intended to present a definite point of view.
 They tend to be popular with audiences favoring the positions they advocate, because of their ability to mobilize popular opinion and interest.
 For the same reason, they tend to stimulate public controversy.
 At an extreme, authored documentaries may take the form of "hybrid" documentaries that incorporate techniques used in fiction.
The Life Science Library is a series of hardbound books published by Time Life between 1963 and 1967, popular in its prime.
 Each of the twenty-six volumes explore a major topic of the natural sciences.
 They are intended for, and written at a level appropriate to, an educated lay readership.
 In each volume, the text of each of eight chapters is followed by a "Picture Essay" lavishly illustrating the subject of the preceding chapter.
 They were available in a monthly subscription from "Life" magazine.
 Each volume takes complex scientific concepts and provides explanations that can be easily understood.
 Einstein's Theory of Relativity is explained in a cartoon about a spy drama involving a train traveling very close to the speed of light; probability is explained with poker hands and the atomic table with common household items.
 Although progress has overtaken much of them, their explanations of basic science and the history of discovery in an area is still excellent.
 The Consulting Editors of the series are microbiologist René Dubos, physicist Henry Margenau, and physicist and novelist C. P. Snow.
Greg Grainger is an Australian film-maker, TV presenter, producer, director, journalist, newsreader, station manager, news director, political correspondent and documentary maker.
 His works spans both high-definition travel and adventure documentaries, to wildlife programs.
 He has numerous distinctions including being a Logie Award winner for "Best News Coverage" (9 Network) and 2011 IAB Awards "Best of Show".
This is a list of haplogroups of historic people.
 Haplogroups can be determined from the remains of historical figures, or derived from genealogical DNA tests of people who trace their direct maternal or paternal ancestry to a noted historical figure.
 Some contemporary notable figures have made their test results public in the course of news programs or documentaries about this topic; they may be included in this list too.
Train Life is a 2006 documentary film about riders on Amtrak's Capitol Corridor.
 It tells the story of life aboard the train through interviews with 12 commuters.
Cinerama Adventure is a 2002 documentary about the history of the Cinerama widescreen film process.
 It tells the story of the widescreen process' evolution, from a primitive multi-screen pyramid process to a Vitarama format that played a big part in World War II, to the three-screen panoramic process it eventually became.
 The film includes interviews with surviving cast and crew who personally worked on the Cinerama films, plus vintage interviews with late creator Fred Waller.
100 Famous Japanese Mountains (日本百名山 , Nihon Hyaku-meizan ) is a book composed in 1964 by mountaineer and author Kyūya Fukada.
 The list became famous when Crown Prince Naruhito took note of it .
 The list has been the topic of NHK documentaries, and other hiking books.
Kristiene Clarke is a documentary director, producer and academic.
 She is the first Transgender filmmaker in the world to have created documentaries addressing the topic.
 She has had extensive education and training in various forms of filming and production, and over 70 flagship films to her name since she began directing and producing in 1988.
 Her work contains themes of cultural, political and sexual diversity and documents the lives and adversity of a variety of people from contrasting backgrounds.
 Throughout her work she strives to challenge stereotypes and ensure individuals' sexuality and trans identity are not withheld from them.
 She believes that analysing how the LGBT community is represented via media platforms such as books, TV and film can provide an insight into the contemporary values held within society.
 Clarke states that there is a popular assumption that transgender individuals are part of a homogeneous group with identical values, and through her filmmaking she aims to unhinge this notion.
Martin Smith (born January 28, 1949) is a producer, writer, director and correspondent.
 Smith has directed dozens of nationally broadcast documentaries for CBS News, ABC News and PBS "Frontline".
 His films range in topic from war in the Middle East to the 2008 financial crisis.

Question: Are Train Life and Cinerama Adventure documentaries about the same topic ?
Answer: no