Here is another cool STEM kit that can introduce your kids to coding and electronics. The MakeKit Hover:bit 2.0 kit is ready for Python and JavaScript programming but also supports block based coding. It has a max drifting speed of up to 18 miles per hour.
You can control this hovercraft from your iOS or Android device. This kit ships with plywood parts, multi:bit board, propellers, batteries, and everything you need to put it together.