Shop customer favorites!

Best Sellers


Showing 1 to 10 of 16

  1. 1
  2. 2
  1. Glowing Horn Unicorn Costume


    Build a unicorn costume with a majestic mane, a noble snout, and a horn that lights up!
  2. Speedy Race Cars


    Create a custom speedy race car and use black washi tape to create a speedway on any surface.
  3. Young Chemist (2-Pack)

    $44.95 $49.90 value

    Ignite a passion for science at an early age and save when purchased as a pack. Recommended for Ages 5+.
  4. Froggie Lab Dissection


    Open Froggie up, then use a pair of kid-friendly tweezers to explore the major internal organs that you and Froggie have in common — heart, lungs, stomach, and more. Then play a diagnosis game to figure out why Froggie isn't feeling well.

    Froggie comes as a finished product, not a DIY building kit.
  5. Animal Bath Bombs


    Learn about acid-base reactions and the science of molecules while mixing up a colorful chemical concoction, then press the mixture into bath-bomb shape. Drop your finished bath bombs into water to see fizzy chemical reactions — in action!
  6. Solar System


    Create your own solar system mobile, complete with a light-up sun in the center.
  7. Pinball Machine


    Design the board, launch, and play, all while discovering pinball game physics!

    Everything needed, from materials to illustrated directions, is included, along with imagine!, a bonus play & learn magazine for kids.

  8. Kiwi Crate Classics (5-Pack)

    $99.95 $124.75 value

    Create your own STEAM-powered adventure at home with this 5-pack bundle of some of our most popular Kiwi crates. There's something here for every budding scientist, artist, or innovator — from hands-on projects to amazing articles.
  9. Light-Up Lantern


    Puzzle together the pieces of an LED-powered lantern, fit for any budding explorer. Sharpen your spatial reasoning skills while crafting with wood, foam, and fabric.
  10. Cannonball Launcher


    Build a launcher that uses elastic power to shoot foam cannonballs. Contains everything you need to build a working launcher and matching mount.


Showing 1 to 10 of 16

  1. 1
  2. 2

Best-Selling Science Kits & STEM Toys

Rich scientific learning needs to have a few of these key elements: curious minds, hands-on projects, quality materials, and fun results. Popular science kits and STEM toys contain all you need to share exciting discoveries with the ones you love most.

With a healthy dose of enthusiasm and the right project, your little scientist will have an unforgettable experience! KiwiCo offers popular science kits that give curious adventurers the ability to tinker, test, and try out their theories! Science can be fun, and that's a theory that can be proven with just the right experiment!