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.
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.
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.