Explore science with Khan Academy's free courses, videos, and exercises in physics, chemistry, biology, and more for a world-class education.

Khan Academy offers free, world-class education in various subjects including math, science, and arts, aiming to make learning accessible for everyone globally.

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Regardless of who you are, mastering even just one more skill on Khan Academy results in learning gains.

Aug 14, 2025 · Free, high-quality science resources for grades 6–12, including hands-on activities, simulations, and teacher tools—all aligned to NGSS, TEKS, and AP standards.

ओह! लगता है कुछ गड़बड़ हो गई। कृपया पुन: प्रयास करें। अरे नहीं, लगता है कोई त्रुटि आ गई है। आपको रिफ्रेश करना पड़ेगा। यदि इसके बाद भी यह समस्या बनी …

Aug 6, 2024 · Our new high school science courses are aligned to the Next Generation Science Standards (NGSS) and include a rich set of learning resources, including brand-new videos, articles, …

Learn about electricity, circuit theory, and introductory electronics. We also have sections that let you get down and dirty with household items, from building your own robot to videos where we disassemble …

Explore advanced computer science topics from algorithms (how we solve common computing problems and measure our solutions' efficiency), to cryptography (how we protect secret information), to …

It has videos, articles, and practice, including course mastery, covering key topics. Use it to get a head start on your high school physics class, for support along the way, or to brush up before you take …