A very good resource to quickly look up physical constants.  The filters to the left make it especially useful.

On-line PDF version of the Knot Tying Manual by Ethicon, Inc.

A systematic review identifies an intervention for a specific disease or other problem in health care, and determines whether or not this intervention works. To do this authors locate, appraise and synthesize evidence from as many relevant scientific studies as possible. They summarize conclusions about effectiveness, and provide a unique collation of the known evidence on a given topic, so that others can easily review the primary studies for any intervention.

Systematic reviews differ from other types of review in that they adhere to a strict design in order to make them more comprehensive, thus minimizing the chance of bias, and ensuring their reliability. Rather than reflecting the views of the authors, or being based on a partial selection of the literature, (as is the case with many articles and reviews that are not explicitly systematic), they contain all known references to trials on a particular intervention and a comprehensive summary of the available evidence. The reviews are therefore also valuable sources of information for those receiving care, as well as for decision makers and researchers.

Modular healthcare reference software. Modules for Emergnecy Medicine, Clinical Rotation, Clinical Nursing, pediatrics, 

Students, Critical care nursing, Oncology nursing, drug info, medical calculators, drug interactions software, and more.

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