All of my kids spent hours pouring over a book we had called 'The Way Things Work' with a delightfully funny Mammoth and a good description of how things actually work
I grew up with this book - I have vivid memories still of the pages about a nuclear reactor - and I was pleasantly surprised to visit a bookshop recently and find it still in print, updated with new things like LIDAR, 3D Printers, MoCap, etc.