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In the classroom process teachers can notice among dyslexics such warning signs as : changed or reversed shapes and sequences of letters and numbers , inconsistent and incoherent spelling , skipping words or lines while reading , poor concentration and high distractibility while reading , word blurring , doubling and size change . The movement to re-engineer university science around more commercial pursuits through ( among other initiatives ) the redirection of the process of attribution of scientific credit towards more formal legal definitions of intellectual property , a movement pioneered in the United States but now happening to varying degrees in most countries with well-developed academic research sectors , is based upon an egregiously incoherent premise , namely , that any viable market-like social structure will take care of all problems of attribution and thus naturally facilitate any format of scientific research . Hydrogen however has a negative coherent scattering factor , and a large incoherent scattering factor , while deuterium has virtually no incoherent scattering , but a large positive coherent scattering factor . Beside causing high background due to its incoherent scattering , the negative coherent scattering of hydrogen tends to cancel out the positive contribution from other atoms in a neutron density map . In spite of the large incoherent contribution , full information about the position of hydrogen atoms can be obtained using neutron powder diffraction , futhermore the presence of hydrogen bonds implies changes in the fine structure when hydrogen is substituted by deuterium . ( In incoherent light , such as that emitted from a light bulb , the wavelengths vary randomly .