Safety standards in consumer products have evolved significantly since the early 20th century, driven largely by advances in test engineering. Technology journalist Alex Davies explores this transformation in his book *How to Keep a Plane in the Sky*, shedding light on the often-overlooked role test engineers play in ensuring everyday items meet rigorous safety requirements.

From hazardous toys in the 1940s, such as the Little Lady Toy Stove—capable of reaching temperatures as high as 600°F despite being marketed to children—to modern innovations, the field of test engineering has developed systematic methods to identify and mitigate risks. These efforts have contributed to the marked decrease in accidents caused by defective or dangerous products.

Davies highlights the critical importance of meticulous and creative testing processes. For instance, the development of child-resistant bottle caps, a seemingly simple yet highly effective safety feature, has helped prevent countless accidental poisonings. The story behind such innovations underscores how test engineers combine technical expertise with inventive problem-solving to address potential hazards before products reach consumers.

The book aims to offer readers a deeper appreciation of the invisible labor behind product reliability, emphasizing that the impressive safety records enjoyed today are not accidental. Instead, they are the result of "hidden, obsessive yet methodical work" by skilled engineers dedicated to pushing the boundaries of testing.

Through a series of compelling examples, Davies illustrates both remarkable successes and notable failures in the quest to improve safety. By bringing these stories to life, he makes a specialized subject engaging and accessible, showing how the field of test engineering continues to evolve in response to new challenges.

Overall, *How to Keep a Plane in the Sky* serves as a reminder that many of the products people use daily are the outcome of complex evaluation and refinement. The ongoing commitment of test engineers remains fundamental to advancing safety standards in an increasingly technology-dependent world.