Age is a complex cross-cutting notion for at least two reasons: the intricate interweaving of its biological and socio-cultural meanings and its dual significance as both a benchmark in an individual's life course and a foundation for social structure. This book offers new perspectives on age and ageing by combining achievements in the biological sciences and their different applications and interpretations in demography, anthropology, psychology and other pertinent disciplines. Thirty contributors from these various fields revisit the measures and the biological models of ageing, the borderline between normal and pathological ageing, the pertinence of chronological age as a benchmark along the life course, its interrelations with psychological development, with reproductive phases and other life events, the «normalizing» role ascribed by age classes and the risk of falling into ageism, the cross-cultural diversity and temporal changes of its meanings, the gender divide (real and perceived), as well as the rights that should be enjoyed at each age.

Supercharge your body’s clock to gain a positively unfair advantage in business and life. What if there is a surefire time in a day to naturally heighten your focus and concentration? Are you tired of dieting and rigorous exercise regime, but not seeing success with fat loss? Do you have difficulty waking up at the same time every day without an alarm clock? This step-by-step guide to optimized body’s clock design teaches: - Science-backed strategies to synchronize your circadian rhythm for optimal performance - Proven practices to lose 4.19 pounds naturally in as little as 2 weeks without giving up the food you love and paying for expensive programs that don’t work - Scientific approach to organize your time productively, so that you can get your work done faster and at double the quality to deliver even more - Latest technology and science to help you sleep better and perform at your best - Essential plan to enjoy the comfort of healthy living without losing your mind - Natural energy boosters to train harder Peak Human Clock helps you reset your biological clocks to maximize every hour of your day.

One of Smithsonian Magazine's Ten Best History Books of 2021 A captivating, surprising history of timekeeping and how it has shaped our world. For thousands of years, people of all cultures have made and used clocks, from the city sundials of ancient Rome to the medieval water clocks of imperial China, hourglasses fomenting revolution in the Middle Ages, the Stock Exchange clock of Amsterdam in 1611, Enlightenment observatories in India, and the high-precision clocks circling the Earth on a fleet of GPS satellites that have been launched since 1978. Clocks have helped us navigate the world and build empires, and have even taken us to the brink of destruction. Elites have used them to wield power, make money, govern citizens, and control lives—and sometimes the people have used them to fight back. Through the stories of twelve clocks, About Time brings pivotal moments from the past vividly to life. Historian and lifelong clock enthusiast David Rooney takes us from the unveiling of al-Jazari’s castle clock in 1206, in present-day Turkey; to the Cape of Good Hope observatory at the southern tip of Africa, where nineteenth-century British government astronomers moved the gears of empire with a time ball and a gun; to the burial of a plutonium clock now sealed beneath a public park in Osaka, where it will keep time for 5,000 years. Rooney shows, through these artifacts, how time has been imagined, politicized, and weaponized over the centuries—and how it might bring peace. Ultimately, he writes, the technical history of horology is only the start of the story. A history of clocks is a history of civilization.

Circadian Rhythm is the natural, 24-hour body's clock, regulating all the body's organ clocks. By learning how to harness all the natural energies within our physical bodies, everyone can become healthier, more energetic, and productive

An introduction to the mathematical, computational, and analytical techniques used for modeling biological rhythms, presenting tools from many disciplines and example applications. All areas of biology and medicine contain rhythms, and these behaviors are best understood through mathematical tools and techniques. This book offers a survey of mathematical, computational, and analytical techniques used for modeling biological rhythms, gathering these methods for the first time in one volume. Drawing on material from such disciplines as mathematical biology, nonlinear dynamics, physics, statistics, and engineering, it presents practical advice and techniques for studying biological rhythms, with a common language. The chapters proceed with increasing mathematical abstraction. Part I, on models, highlights the implicit assumptions and common pitfalls of modeling, and is accessible to readers with basic knowledge of differential equations and linear algebra. Part II, on behaviors, focuses on simpler models, describing common properties of biological rhythms that range from the firing properties of squid giant axon to human circadian rhythms. Part III, on mathematical techniques, guides readers who have specific models or goals in mind. Sections on “frontiers” present the latest research; “theory” sections present interesting mathematical results using more accessible approaches than can be found elsewhere. Each chapter offers exercises. Commented MATLAB code is provided to help readers get practical experience. The book, by an expert in the field, can be used as a textbook for undergraduate courses in mathematical biology or graduate courses in modeling biological rhythms and as a reference for researchers.

The ability at the molecular level to keep track of time is a property shared by organisms ranging from the simplest unicells to humans. The primary feature of these biological clocks is their ability to entrain to environmental stimuli. The dominant stimulus comes from environmental light cues, which requires the existence of photopigments sensitive to light. The exact identity of the molecules involved in circadian photoreception has remained elusive. The classical view of the circadian system is of diverse physiological rhythms regulated by a centralized clock structure. This book presents evidence that challenges this view. Experiments in both vertebrate and invertebrate systems demonstrate that the circadian timing system is dispersed throughout the animal and suggest that possibly every cell contains an autonomous clock mechanism. A variety of tissues and cells contain have been shown to maintain an oscillation when placed in vitro and removed from any external cues or signals that originate from the classical clock structures and/or the environment. This book draws together contributions from an international and interdisciplinary group of experts whose work is focused on all aspects of the topic. Coverage includes the mechanisms of light signalling to the vertebrate clock, the connections between central and peripheral clocks, circadian gene expression patterns and output pathways of clock mechanisms.

Explores the many aspects of circadian rhythms, from jet lag to biorhythms to "forbidden phases" of sleep when one cannot awaken spontaneously.