Updated November 2025
Understanding scientific principles and practices is essential for every person. Without scientific literacy, people are subject to false or inflated advertising claims, misplaced fears, and a general inability to understand the modern world. And of course, science-based careers are among the fastest-growing employment sectors.
But science is a broad term that includes a large subset of specific topics, all of which are tricky to learn or teach—if you’re not a scientist yourself. Or even if you are, for that matter!
The following free science lessons and activities are designed to help students learn about the world of science by engaging them with fascinating facts, intriguing interactives, and compelling projects. This article is the first of our STEAM series, which will curate the best teaching resources for science, technology, engineering, arts, and math.
Best Free Science Lessons & Activities
Applied Science Videos
Hardware engineer and Google Life Science director Ben Krasnow hosts an amazing YouTube channel featuring DIY and hands-on explorations of chemistry, electricity, and physics (with some biology thrown in to make it even more interesting). The projects range from esoteric to everyday, so there’s sure to be something for everyone. Intriguing titles such as ‘Holograms on Chocolate” and “Olestra (zero calorie cooking oil) - chemical synthesis and taste test” are sure to engender interest. Best for advanced and higher education students.
Science Friday Educate
An extensive collection of science lessons from the Science Friday radio program. Learn how to draw a congressional district, think like a squirrel, or test your taste receptors with spicy treats. Search for standards-aligned lessons by grade, duration, subject and STEM practice. English and Spanish.
Colorado State University Little Shop of Physics Lesson Plans & Guides
You’ll be hard pressed to find physics lesson plans with the level of detail provided by the Little Shop of Physics. Each lesson begins with a basic but important question, such as, “Can energy be created or destroyed?” or “Does air weigh anything?” (My favorite is “Why do raindrops sometimes land gently and sometimes with a splat?”) The downloadable PDF provides an overview of the question, the underlying theories, helpful images, the experimental plan for students, and questions to ask during the process. Note that links referring to CMMAP should be substituted with https://hogback.atmos.colostate.edu/cmmap.
Annenberg Learner Science Resources
Fine selection of interactives that are great for teaching, as well as professional development. Standards-based topics include physics, biology, geology, how kids learn, and more. Each detailed, grade-appropriate lesson provides a skills quiz as well as related materials in the form of research summaries of relevant topics.
Exploratorium Tools for Teaching and Learning
From the acclaimed Exploratorium museum comes this fine selection of science videos, activities, and lessons. Browse by type of activity or topic. No time for a big multi-day project? Try the science “snacks,” teacher-tested activities for the classroom using inexpensive and easy-to-find materials.
World Wildlife Fund Educator Toolkits
Available in English and Spanish, each toolkit focusses on an appealing species—such as tigers, polar bears, and monarch butterflies—and includes an educator resource guide, classroom presentation, and cross-curriculum activities. Bonus: easy-to-navigate website.
Science Lesson Plans
Thousands of science-themed lesson plans, games, worksheets, and more invite educators to explore everything from plant growth to the solar system to the human brain. Organized by type, grade, subject, and standard.
K-5 Everday Science ACS American Chemistry Society
Fine selection of chemistry lessons for K-5 students. Lessons are organized by grade, are NGSS-aligned, and follow the 5E (Engage-Explore-Explain-Extend-Evaluate) lesson plan format. Includes a set of remote learning lessons for fifth graders.
California Academy of Sciences Science Lesson Plans
Strong collection of multimedia science lessons, searchable by grade, language, and subject. Topics range from astronomy to tectonic plates to African safari. While a few of these NGSS-based lessons are intended for museum visitors, most are classroom lessons that can be taught in any school.
High Adventure Science
A free online science curriculum that examines some of the most important unanswered questions in Earth and space science, such as climate change, freshwater access, and life on other planets. Features include pre- and post-tests as well as interactive simulations. Create a class online to track student progress.
Science News for Students
A fascinating look at a wide range of science topics in the news. What’s a smellscape? Are there active volcanoes on Mars? How do octopuses taste food? And—perhaps most important—can we make vibranium? Articles are accompanied by free classroom resources.
Zooniverse
True or false: Anyone can do real scientific research, regardless of credentials. Answer: True. With Zooniverse, that is! Volunteers browse the ongoing projects and select the one they’d like to contribute to. Want to spot clouds on Mars? How about decoding bacterial DNA to help fight disease? The astonishing diversity of projects includes not only scientific research but also historical, linguistic, and literary. Ideal for advanced students and PBL.
Frontiers for Young Minds
Like Zooniverse, Frontiers for Young Minds invites young scientists to participate in real research. In this case, students serve as reviewers of journal articles that have been rewritten specifically for young learners. A great way for kids to start understanding how research is communicated in real life. Bonus: All Young Minds articles are free to access, download, and reproduce in your educational materials, with citation.
Science Buddies
A wealth of lesson plans, videos, science projects, experiments, and more for K-12 science teaching and learning. Search by science topic, grade, materials, and type of resource. Integrates with Google Classroom.
Project Noah Wildlife School
Aimed at elementary and middle school students, Project Noah invites kids to explore wildlife through their own backyards and communities. Each standards-based lesson includes anatomy, life cycle, and behavior as well as great graphics and images. Be sure to check out the interactive wildlife challenges, which explore specific aspects of wildlife more deeply. Kids can design a protective turtle tunnel, build an animal track station, or test a hypothesis.
Lawrence Hall of Science Apps
Eight awesome games that immerse students in some of the most amazing science topics ever, from how living cells function to nutrition to sun science. Four apps are iOs only, while the remaining are iOs, Android, or browser-based. Excellent science fun!
