Life at the Extremes by Frances Ashcroft
My rating: 5 of 5 stars
Anyone interested in the limits of human physiology will find this book fascinating. Technically, its subject matter is broader than that, considering the environmental limits of living creatures, generally. However, all but the last chapter focuses on how humans react to (and adapt to) extreme conditions. Chapters one through six explore the challenges and limitations of humans under extreme conditions of elevation (ch. 1,) of pressure [underwater] (ch. 2,) of heat (ch. 3,) of cold (ch. 4,) of intense physical activity [running-centric, but deals with strength and power as well] (ch. 5,) and in space (ch. 6.) Then, each chapter reflects upon examples of species that are extremely well-adapted to said conditions, and why. (e.g. After learning about how and why humans have to acclimate to survive high elevation treks, one learns about the bar-headed goose, a bird that can go from sea level to flying over Everest – all in the same day.)
The final chapter (ch. 7) is a bit different in that it discusses extremophiles, creatures that can survive in a wide range of conditions (e.g. acidity, temperature, lack of moisture, lack of oxygen, etc.) that would be certain death not only for humans but for any animals. Most of the species discussed are either single-celled creatures or tiny multi-cellular life (e.g. Tardigrades.) With respect to humans, there is a discussion of the limits and present understanding of suspended animation.
This book offers an intriguing look at life at the extremes. While written by a Professor of Physiology, it’s highly readable for a general audience. It mixes narrative examples in with the discussion of physiology to make the material approachable and engaging. I’d highly recommend this book.
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