A reference and teaching tool, and one that should have wide acceptance for the young family bookshelf as well. Here at a reasonable price is a 20 volume introduction to all physical and natural sciences. The interest level is broad gauged:- the apt and interested third grader will find an immense amount of practical accessible information among the 000 entries; somewhat reluctant 9th grader will not feel himself written down to but will be able to make himself cognizant of the world around him. Over ,000 entries, livened by 2500 illustrations in somewhat postery technique and color, along with 200 science projects and experiments afford a choice that will touch every interest. Cross indexing, bibliography for further study, study guides that will aid parent's and teachers make this a practical tool. A sound approach is guaranteed by the contributors chiefly teachers of science, along with special articles in technical fields.