Engagingly, enlighteningly but always also humorously and entertainingly recounted (and graced by John O'Brien's fun but really never too in-one's face and interfering accompanying panel like illustrations) with both basic and much supplemental informational details on each of the presented, on each of the featured inventions, Charlotte Foltz Jones' Mistakes That Worked: 40 Familiar Inventions & How They Came to Be shows a versatile, varied combination of forty common household objects, medicines and other innovations that emerged, that came into being either by mistake or by accident (and with the latter in mind, I personally would not be using the title Mistakes That Worked, as while many of the examined creations like fudge, scotch guard, post-it notes etc. were indeed due to actual manufacturing mishaps, many of the inventions definitely came into being more because of plain and simple serendipity and others, like the eponymous sandwich due to inventive imagination and human ingenuity, because the Earl of Sandwich wanted to be able to continue eating whilst still engaging in his penchant for gambling, or potato chips owning their emergence because of a chef getting annoyed at a patron constantly wanting thinner potato slices and actually creating the chips to deliberately annoy said patron, who though loved them and kept asking for more). Combined with that which is so important and essential to and for me with regard to a decent and useable non fiction tome for children (for older children above the age of eight or nine), namely a select but extensive bibliography as well as an appreciated index, Mistakes That Worked: 40 Familiar Inventions & How They Came to Be is pretty well a near perfect combination of specific historic, scientific, cultural details and so-called fun and entertaining little factoids (never tedious, always engaging, and yes, most importantly, also presenting such important and essential nuggets of knowledge that for instance aspirin should not be taken by individuals younger than sixteen years of age due to its links to Reye's syndrome and that appreciatively, Charlotte Foltz Jones also points out essential health and safety measures for children using the kitchen, such as being careful and prudent with regard to utilising utensils, appliances and such, following recipes and yes, always having proper adult supervision when cooking).