arXiv is a free open-access archive for scholarly preprints in physics, mathematics, computer science, and related fields. Researchers submit and discover the latest papers, enabling fast access to cutting-edge work before formal peer review.
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Britannica
britannica.com
Britannica is an English reference site for students, teachers and curious readers who need concise encyclopedia articles, topic overviews, videos, quizzes and dictionary lookups.
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Wikipedia
wikipedia.org
Wikipedia is a multilingual online encyclopedia for quick background research. It helps readers explore topics, follow citations, and compare coverage across languages.