Build a Mangonel and experience the launch power of a medieval siege engine! Did you know that a Mangonel was a type of catapult used during the medieval period to throw objects at a low trajectory and high velocity to destroy castle walls? 37 pieces. Assembled sizes 4.2" x 7.7" x 16.5".

Discover how acrobats manage to stay balanced while walking on a tightrope or doing handstands with the Koontz™ Walking the Tightrope kit! Did you know that the center of mass is an imaginary point on a body where all of its mass is considered to be concentrated? To stay balanced, an acrobat needs to position his/her center of mass over the base of his/her body. 25 pieces total. Assembled sizes: Acrobat - 3.5" x 2.75" x .33", Parrot - 6" x 3" x 2", Penguin - 4.75" x 4.75" x 2.3", Stand - 4.5" x 4.25" x 4".

Discover the secret to the wheel's motion with the Koontz™ Boomerang Wheel kit! Did you know that the wheel conserves energy by converting potential energy into motion? 15 pieces. Assembled size is 3.5" x 5.1".

Discover how the incredible jet force propels boats, planes, and missiles with the Koontz™ Jet Car kit. Did you know that a jet engine shoots out a strong gust of air from the back end of the vehicle, which propels the vehicle forward? 22 pieces. Assembled size is 6.3" x 3.75"

Discover the secret to the clock's hand movements with a Koontz™ Clock kit. Did you know in a mechanical clock, the motion of the hands depends on the motion of the gears? 21 pieces. Assembled size is 3.9" x 6.3" x 2.3".

Discover the inner workings of a combination lock used in safes with the Koontz™ Safe Kit! Did you know that each lock on a safe is a puzzle? 55 pieces. Assembled size is 4.4" x 3.15" x 4.75".

Discover how to crack the code of an ancient puzzle with the Koontz™ Combination Lock kit. Did you know that each combination lock is a puzzle? Only one combination can open the lock's unique design. 14 pieces. Assembled size is 3.15" x 3.15" x 4.4".

Build your own Dynamometer and measure the force exerted by the Earth's gravity on objects around you. Calibrate your Dynamometer and explore how it works. Each Dynamometer has 5 pieces and 1 rubber band. Includes materials to make 24 sets and teacher instruction sheet complete with scientific facts and activities

Can you make the colors of the button disappear? Simply roll the rope and release it by repeatedly pulling the handles. The button in the middle will start spinning at high speed. Each set consists of 3 buttons and 1 rope. Includes materials to make 24 sets and teacher instruction sheet complete with scientific facts and activities.

Build a device that will allow you to explore Bernoulli's Principle. What will happen to the two balls when you blow air through the straw between them. Each device has 18 pieces, 2 foam balls, and 1 rope. Includes materials to make 24 sets and teacher instruction sheet complete with scientific facts and activities.

Discover how people communicated long distances before the telephone! The Morse Code Experiment kit was designed to show the principle of the telegraph.

A few of the activities in this Video lab include analyzing the distribution of earthquakes and volcanoes, demonstrating convection and plate motion and learning about the scale and features of the Earth's crust. A full week's worth of activities! Includes the video or DVD Plate Tectonics: The Puzzles of the Continents, Teacher's Guide and enough materials for 12 lab stations.

This puppet does it all and his cuddly softness appeals to all ages and sensory needs. The glove fitting hands bring Jake to life and aid in emphasizing lessons, teaching sign language, as well as holding books or other manipulatives. Jake carries the numbers 1-10 in his pocket to help with number recognition and practice. He has a moveable tongue and mouth, to help model behaviors for language development, delayed speech, picky eaters, or children with oral defensive issues. Complete with activity suggestions, Jake makes the perfect assistant for teachers or speech and occupational therapists!

This puppet does it all and her cuddly softness appeals to all ages and sensory needs. The glove fitting hands bring Susanne to life and aid in emphasizing lessons, teaching sign language, as well as holding books or other manipulatives. Susanne has a moveable tongue and mouth, to help model behaviors for language development, delayed speech, picky eaters, or children with oral defensive issues. Finally Susanne's clothing features a zipper and tie shoes for teacher or therapist demonstration, or student practice. Complete with activity suggestions, Susanne makes the perfect assistant for teachers or speech and occupational therapists!

The Social Skills Puppet Set featuring Max and Millie is here to help enhance the social lessons in the classroom or therapy setting. Eight categories of behavior are covered and include sharing experiences, being nice, playing and working together, performing a task, presenting yourself, making choices, standing up for yourself, and dealing with conflict. Each category includes a lesson featuring a story targeting the behavior, puppet dialogue to engage the children, illustrations for coloring, and different exercises to further discussion. Twelve full color cards are also included to aid children in exploring the feelings and emotions associated with different social situations. 71 pages. 1 Max hand puppet. 1 Millie hand puppet. Ages 4-8, Grades PreK-3.