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2 giorni fa · References. External links. Vitamin D. For other uses, see Vitamin D (disambiguation). This article is about the family of D-"vitamins". For individual forms, see ergocalciferol, cholecalciferol, vitamin D4, vitamin D5, and calcitriol.
2 giorni fa · Open access (OA) is a set of principles and a range of practices through which research outputs are distributed online, free of access charges or other barriers.
2 giorni fa · e. The history of the Internet has its origin in the efforts of scientists and engineers to build and interconnect computer networks. The Internet Protocol Suite, the set of rules used to communicate between networks and devices on the Internet, arose from research and development in the United States and involved international collaboration ...
4 giorni fa · World History. Does history really repeat itself, or can we learn from the mistakes of those who came before us? History provides a chronological, statistical, and cultural record of the events, people, and movements that have made an impact on humankind and the world at large throughout the ages. Browse Subcategories.
Science. How can the sky be blue one day and stormy the next? Why do heavy objects tend to fall downwards when dropped? How are birds able to fly (and why can’t I do the same?)? Human beings have long been curious about the world in which we live, striving to identify connections among the phenomenons we witness and to understand how it all works.
3 giorni fa · Health & Medicine. The study of the human mind and body, how these function, and how they interact—not only with each other but also with their environment—has been of utmost importance in ensuring human well-being. Research on potential treatments and preventive medicine has expanded greatly with the development of modern medicine, and a ...
3 giorni fa · Reference Sources. Use HOLLIS to find books useful for overviews, context and background such as subject encyclopedias (Example), including ones contemporary with your era of interest ( Example ). Encyclopedias, dictionaries, and handbooks are handy for getting a quick general overview of a specific topic. You can try searching in ...
