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  • The pattern of treatment of issues in this new edition follows that established with the fourth edition; nevertheless there are important changes. For instance, in the preface to the previous edition I wrote, “The five years since the third edition of Human Evolution: An Illustrated Introduction have been an extraordinarily productive time for paleoanthropology,” not least because of the number of new species of early humans that had been discovered. The same can be said of the period between the fourth and fifth editions. Since 1999 four new species of hominin have been announced.

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  • Medical practitioners and health care educators must be continually vigilant of the growing and ever-changing health issues related to girls and women who lead an active lifestyle and participate in sports and exercise. There have been landmark legislations that have changed the social perception that girls and women not only can, but should be physically active. With any changing social milieu, there are evolving health issues associated with the journey.

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  • The thought of mucus disturbs many people. Mucus is beneficial as the first defense of the airways. The mucus lining traps inhaled particles and allows them to be cleared from the airway by cilia and cough. The mucus layer also prevents dehydration and desiccation of the airway surface and provides a nutrient milieu for the ciliated epithelium. Mucus can also be quite bad. Airway mucus retention due to hypersecretion or poor mucus clearance is a characteristic of many airway diseases including cystic fibrosis, chronic bronchitis, bronchiectasis, and asthma.

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