Teaching STEM in the early years enables children to make those vital connections between everyday life and the STEM disciplines. It also lays down the foundations for future academic success because the skills learned are transferable to other subjects.
PBS Design Squad is a great site for all things STEM. Students might need adult support for some of it.
And lots of other interesting videos not just on engineering!
Technovation Families is a perfect source of inspiration to fuel curiosity, creativity, and perseverance while learning about the science and technology that will drive the future. Free but requires an account to be made.