Nature's Unifying PatternsDetailed descriptions and examples
Bones respond to stresses placed upon them by adding material (calcium) where more is needed to provide strength. This is why women are encouraged to do weight-bearing exercises to prevent brittle bones as they age. While a heavy bone may be stronger (e.g., the weight is maximized), the energy costs of the body carrying around extra weight is high. Therefore, if the body senses that the bone doesn’t need strength in some areas, it removes the calcium (e.g., the weight is optimized).
There is a growing community of people who are designing and living in ultra-efficient “tiny houses.” Many examples are barely more than 100 square feet (or less than 10 square meters) but provide all the basic functions of a full-sized home using a variety of design strategies.