Air, water, heat, light, sound, electricity and the weather are the main phenomena covered in this book of simple physics experiments and explanations of natural processes. Experiments- and there are enough to keep one going for a long time- include many of the old familiar ones:- breaking a stick with air pressure, making a simple battery and so forth. There is a section of trick ones at the end. Generally, the book seems well grounded. We did notice one or two rather vague measurements for experiments- but elsewhere it seems a good home workbook that goes quite far, if not all the way, into casual relationships.