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Explore the fact-checked online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of objective articles, biographies, videos, and images from experts.

Listen to recent changes on Wikipedia

Wolfram|Alpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.

在线字典——包括多种字典：英语字典、医学字典、法律字典、金融字典、计算机字典、词库、缩略语字典、成语字典、词库、哥伦比亚百科、维基百科、哈钦森文学百科全书、古典文学例句、发音、单词浏览程序、生词本。免费查阅

Encyclopedia.com – Online dictionary and encyclopedia with pictures, facts, and videos. Get information and homework help with millions of articles in our FREE, online library.

Fast, offline, and free documentation browser for developers. Search 100+ docs in one web app: HTML, CSS, JavaScript, PHP, Ruby, Python, Go, C, C++…

Astronomical simulator and predictor of planet orbits

Drag and drop countries around the map to compare their relative size. Is Greenland really as big as all of Africa? You may be surprised at what you find! A great tool for educators.

an interactive guide to the game theory of why & how we trust each other

This huge collection of non-scary optical illusions and fascinating visual phenomena emphasizes interactive exploration, beauty, and scientific explanation.

Test your color vision with the EnChroma Color Blindness Test. You'll get a comprehensive report with recommendations for EnChroma color-blindness glasses.

Piixemto has various free personality tests, quizzes and social content with easy sharing opportunities.

We design and create original, high quality, fun quizzes, covering personality, knowledge, relationships and more.

The original online game that spawned the amazing 20Q handheld toy.

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NASA brings you images, videos and features from the unique perspective of America's space agency. Get updates on missions, watch NASA TV, read blogs, view the latest discoveries, and more.

腾讯云自然语言处理（NLP）深度整合了腾讯内部顶级的 NLP 技术，依托千亿级中文语料累积，提供16项智能文本处理能力，包括智能分词、实体识别、文本纠错、情感分析、文本分类、词向量、关键词提取、自动摘要、智能闲聊、百科知识图谱查询等，满足各行各业的文本智能需求。

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