RS4K Reader Library

A Complete K-2 Science Library: 71 Illustrated Readers Across Six Subjects

The RS4K Reader Library brings the same atoms-first foundation as the full Real Science-4-Kids curriculum to independent reading. Chemistry, biology, physics, geology, astronomy, and exercise science, written and leveled for young readers from kindergarten through second grade.

Read independently, share at story time, or project for the whole class.

Choose Your Format

📱 Digital: $149 for 18 months
All 71 readers, anytime, through the RS4K Reader Library webpage. Each book opens as a full-screen flipbook, perfect for independent reading, classroom projection, or curling up on the couch. New titles released during your access period are included automatically. That's about $2 per reader.

📚 Print: $749 for the complete 71-book set
All 71 readers as a physical library. A great fit for families who prefer real books on the shelf, want a permanent science library, or are outfitting a classroom or science center.

📱📚 Digital + Print: $839
Everything: the full print library and 18 months of digital access. Project the flipbook for the lesson, hand a printed copy to a child to read alongside, and use whichever format fits the moment. The most flexible way to use the RS4k Reader Library.

What's in the Library

Chemistry: 11 Readers
The atoms-first foundation, connected to everyday things kids can see and touch.

• Atoms · French Fries and Fizzy Pop! · Plastic Pink Flamingos · What Is Chemistry?
• DNA · Proteins · Acids and Bases · Molecules · Atoms and Molecules Meet
• Solids, Liquids, and Gases · Mixtures

Biology: 23 Readers
From single cells to whole ecosystems, the living world up close.

• Animals · Life · Sea Jellies · Sponges · What Is Biology?
• The Cell: A Tiny City · Photosynthesis · Protozoa · Frogs and Toads · Microscopes
• Bats · Worms · Mushrooms, Molds, and Bread Bugs! · Plants · Viruses
• Sea Stars · Birds · Duck-billed Platypus · Mammals · Plant Cells vs Animal Cells
• Reptiles · The Biosphere · Whales

Physics: 12 Readers
Motion, energy, light, sound, and the everyday physics kids can see in action.

• What Is Physics? · Energy · Linear Motion · Work · Inertia
• Force · Heat · Light We Can See · Sound · Temperature · Waves
• Wheels on a Bike: Rotational Motion

Geology: 9 Readers
Earth's layers, systems, and the processes that shape the world beneath our feet.

• What Is Geology? · Earth's Layers · Earth's Spheres · Earthquakes · Moving Plates
• The Atmosphere · The Geosphere · The Hydrosphere · Volcanoes

Astronomy: 7 Readers
From the sun and moon to distant galaxies and nebulae.

• Constellations · Galaxies · Nebulae · Planets · Stars · The Moon · The Sun

Exercise Science: 9 Readers
Real body science, covering how kids move, grow stronger, and stay healthy.

• What Is Exercise Science? · Getting Stronger · How Does Your Body Work?
• How to Win a Race · Muscles · Nervous System · Nutrition · Running Faster
• What Happens When We Age?

What Makes These Readers Different

One framework, every subject. Whether the topic is volcanoes, viruses, or velocity, every reader starts from the same idea: everything is made of atoms. Kids build a single mental model and apply it everywhere.

Written for K-2. Lexile levels run from 230L to 540L, making it easy to match a book to a reader or stretch a little for a read-aloud. Every book is short enough to finish in one sitting.

Real science, not "kid science." The vocabulary is accessible, but the ideas aren't watered down. Children learn the actual words scientists use and what they mean.

Always growing. New readers are added regularly. Digital customers see them appear automatically. Print customers can add new releases as they come out.

Who It's For

• Homeschool families who want serious science from the very beginning
• K-2 classrooms using (or curious about) the Real Science-4-Kids curriculum
• Science centers, co-ops, and tutoring programs looking for read-alouds and science stations backed by real content

What to Expect

Digital access. Sign in on any computer, tablet, or interactive whiteboard. Books open in a full-screen flipbook viewer in your browser, no app to install. Your 18 months begin on the day of purchase.

Print fulfillment. Print orders are produced on demand and typically ship within 5 to 7 business days. You'll receive tracking once your order ships.

New titles. New readers are released throughout the year. Digital subscribers get them automatically. Print customers can purchase new titles as they're added.

Questions? Reach out anytime. We're happy to help you figure out which format is right for your family or classroom.