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There are at least four different philosophical perspectives that describe how the work in chemistry education is carried out. The first is what one might call a practitioner’s perspective, wherein the individuals who are responsible for teaching chemistry (teachers, instructors, professors) are the ones who ultimately define chemistry education by their actions.

A second perspective is defined by a self-identified group of chemical educators, faculty members and instructors who, as opposed to declaring their primary interest in a typical area of laboratory research (organic, inorganic, biochemistry, etc), take on an interest in contributing suggestions, essays, observations, and other descriptive reports of practice into the public domain (such like Chemistry help, Chemistry ProblemsChemistry Answers at tutorvista, tutoring is available 24X7)  , through journal publications, books, and presentations. Dr. Robert L. Lichter, then-Executive Director of the Camille and Henry Dreyfus Foundation, speaking in a plenary session at the 16th Biennial Conference on Chemical Education, posed the question “why do terms like ‘chemical educator’ even exist in higher education, when there is a perfectly respectable term for this activity, namely, ‘chemistry professor.’ One criticism of this view is that few professors bring any formal preparation in or background about education to their jobs, and so lack any professional perspective on the teaching and learning enterprise, particularly discoveries made about effective teaching and how students learn.

A third perspective is chemical education research (CER). Following the example of physics education research (PER)-find Physics helpPhysics ProblemsPhysics Answers, Physics problem solver at tutorvista-, CER tends to take the theories and methods developed in pre-college science education research, which generally takes place in Schools of Education, and applies them to understanding comparable problems in post-secondary settings (in addition to pre-college settings). Like science education researchers, CER practitioners tend to study the teaching practices of others as opposed to focusing on their own classroom practices. Chemical education research is typically carried out in situ using human subjects from secondary and post-secondary schools. Chemical education research utilizes both quantitative and qualitative data collection methods. Quantitative methods typically involve collecting data that can then be analyzed using various statistical methods. Qualitative methods include interviews, observations, journaling, and other methods common to social science research.

Finally, there is an emergent perspective called The Scholarship of Teaching and Learning (SoTL). Although there is debate on how to best define SoTL, one of the primary practices is for mainstream faculty members (organic, inorganic, biochemistry, etc) to develop a more informed view of their practices, how to carry out research and reflection on their own teaching, and about what constitutes deep understanding in student learning.


Blowfish designer

Blowfish is a keyed, symmetric block cipher, designed in 1993 by Bruce Schneier and included in a large number of cipher suites and encryption products. Blowfish provides a good encryption rate in software and no effective cryptanalysis  of it has been found to date. However, the Advanced Encryption Standard now receives more attention.

Schneier designed Blowfish as a general-purpose algorithm, intended as a replacement for the aging DES and free of the problems and constraints associated with other algorithms. At the time Blowfish was released, many other designs were proprietary, encumbered by patents or were commercial/government secrets. Schneier has stated that, “Blowfish is unpatented, and will remain so in all countries. The algorithm is hereby placed in the public domain, and can be freely used by anyone.”

Notable features of the design include key-dependent S-boxes and a highly complex key schedule.

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