At the Wyss/Harvard Education site below you will find text and videos describing a number of new devices/technologies under development. They range form air pollution control to micro robots and various prosthetic devices and more. Especially explore the “Technology” section of the site. It may be beyond the grasp of little kids, but with your help at interpretation I think they may find it intriguing as well. Please post questions that arise and let us know how it goes.
https://wyss.harvard.edu/technology/soft-exosuit/