Hydraulics Engineering STEM Kit by Lakeshore

$49.99 (ages eight and older)

Let your child explore the mechanical power of liquid in motion with a build-your-own hydraulic machine. Syringes and tubes can be filled with water and connected to each machine in order to convert energy and set the machine in motion. Your child will become a little engineer right before your eyes.
Lakeshore Learning Store, 1400 Oaklawn Ave., Cranston, 463-8800, lakeshorelearning.com.

Image from lakeshorelearning.com.