BestLearn

English Challenge offers self-assessment and practice for English vocabulary, grammar, and reading comprehension, suitable for students, professionals, and English enthusiasts. Real-time feedback and a wrong answer notebook feature facilitate efficient learning. Try it now!

ManyBooks offers tens of thousands of free eBooks for download and online reading, supporting PDF, EPUB, MOBI and other formats compatible with various reading devices. Intelligent categorization, search, and personalized recommendations help you quickly find your favorite books. Experience smooth reading now!

PhET Interactive Simulations offers 150+ free interactive science simulations covering physics, chemistry, biology, and more, helping students intuitively understand principles and teachers easily prepare and teach lessons. Experience lively and engaging science experiments now!

Bohrium is a new AI-powered research platform for global scientists. It aims to offer researchers worldwide a new paradigm with technological innovation, making knowledge acquisition, understanding, and application smarter and more efficient.