Question: Despite popular conceptions promoted by movies and television, many US police departments prefer not to maintain officers in non-patrol bureaus and divisions beyond a certain period of time, such as in the detective bureau, and instead maintain policies that limit service in such divisions to a specified period of time, after which officers must transfer out or return to patrol duties.[citation needed] This is done in part based upon the perception that the most important and essential police work is accomplished on patrol in which officers become acquainted with their beats, prevent crime by their presence, respond to crimes in progress, manage crises, and practice their skills.[citation needed]
Try to answer this question if possible: What do all police departments make detectives go back to periodically?
Answer: unanswerable
Question: Classification seeks to describe the diversity of bacterial species by naming and grouping organisms based on similarities. Bacteria can be classified on the basis of cell structure, cellular metabolism or on differences in cell components, such as DNA, fatty acids, pigments, antigens and quinones. While these schemes allowed the identification and classification of bacterial strains, it was unclear whether these differences represented variation between distinct species or between strains of the same species. This uncertainty was due to the lack of distinctive structures in most bacteria, as well as lateral gene transfer between unrelated species. Due to lateral gene transfer, some closely related bacteria can have very different morphologies and metabolisms. To overcome this uncertainty, modern bacterial classification emphasizes molecular systematics, using genetic techniques such as guanine cytosine ratio determination, genome-genome hybridization, as well as sequencing genes that have not undergone extensive lateral gene transfer, such as the rRNA gene. Classification of bacteria is determined by publication in the International Journal of Systematic Bacteriology, and Bergey's Manual of Systematic Bacteriology. The International Committee on Systematic Bacteriology (ICSB) maintains international rules for the naming of bacteria and taxonomic categories and for the ranking of them in the International Code of Nomenclature of Bacteria.
Try to answer this question if possible: What supports the uncertainty in classification between the same kind of bacteria?
Answer: lack of distinctive structures in most bacteria,
Question: Across London, Black and Asian children outnumber White British children by about six to four in state schools. Altogether at the 2011 census, of London's 1,624,768 population aged 0 to 15, 46.4 per cent were White, 19.8 per cent were Asian, 19 per cent were Black, 10.8 per cent were Mixed and 4 per cent represented another ethnic group. In January 2005, a survey of London's ethnic and religious diversity claimed that there were more than 300 languages spoken in London and more than 50 non-indigenous communities with a population of more than 10,000. Figures from the Office for National Statistics show that, in 2010[update], London's foreign-born population was 2,650,000 (33 per cent), up from 1,630,000 in 1997.
Try to answer this question if possible: A 2005 survey indicated that how many communities comprised of non-indigenous people existed in London?
Answer: more than 50
Question: Today, nearly all commonly used video compression methods (e.g., those in standards approved by the ITU-T or ISO) apply a discrete cosine transform (DCT) for spatial redundancy reduction. The DCT that is widely used in this regard was introduced by N. Ahmed, T. Natarajan and K. R. Rao in 1974. Other methods, such as fractal compression, matching pursuit and the use of a discrete wavelet transform (DWT) have been the subject of some research, but are typically not used in practical products (except for the use of wavelet coding as still-image coders without motion compensation). Interest in fractal compression seems to be waning, due to recent theoretical analysis showing a comparative lack of effectiveness of such methods.
Try to answer this question if possible: What does a DCT do?
Answer:
spatial redundancy reduction