Living clocks (145 resultados)

Título: 
Refinar con la Búsqueda avanzada

Filtrar la búsqueda

  • Libros (145)

a

Intervalo de precios personalizado (EUR)

a

  • Idioma: Inglés

    Editorial: Yale University Press, 2005

    0300109695 / 9780300109696

    • Tapa blanda

    Librería: World of Books (was SecondSale), Montgomery, IL, Estados Unidos de AmericaWorld of Books (was SecondSale)

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Aceptable

    EUR 4,22

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 2 disponibles

    Paperback. Condición: Good. Why can't teenagers get out of bed in the morning? How do bees tell the time? Why do some plants open and close their flowers at the same time each day? Why do so many people suffer the misery of jet lag? In this fascinating book, Russell Foster and Leon Kreitzman explain the significance of the biological clock, showing how it has played an essential role in evolution and why it continues to play a vitally important role in all living organisms. The authors tell us that biological clocks are embedded in our genes and reset at sunrise and sunset each day to link astronomical time with an organism's internal time. They discuss how scientists are working out the clockwork mechanisms and what governs them, and they describe how organisms measure different intervals of time, how they are adapted to various cycles, and how light coordinates the time within to the external world. They review problems that can be caused by malfunctioning biological clocks-including jet lag, seasonal affective disorder, and depression. And they warn that although new drugs are being promoted to allow us to stay awake for longer periods, a 24/7 lifestyle can have a harmful impact on our health, both as individuals and as a society.…

  • Idioma: Inglés

    Editorial: Yale University Press, 2005

    0300109695 / 9780300109696

    • Tapa blanda

    Librería: World of Books (was SecondSale), Montgomery, IL, Estados Unidos de AmericaWorld of Books (was SecondSale)

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Regular

    EUR 4,22

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Paperback. Condición: Fair. Why can't teenagers get out of bed in the morning? How do bees tell the time? Why do some plants open and close their flowers at the same time each day? Why do so many people suffer the misery of jet lag? In this fascinating book, Russell Foster and Leon Kreitzman explain the significance of the biological clock, showing how it has played an essential role in evolution and why it continues to play a vitally important role in all living organisms. The authors tell us that biological clocks are embedded in our genes and reset at sunrise and sunset each day to link astronomical time with an organism's internal time. They discuss how scientists are working out the clockwork mechanisms and what governs them, and they describe how organisms measure different intervals of time, how they are adapted to various cycles, and how light coordinates the time within to the external world. They review problems that can be caused by malfunctioning biological clocks-including jet lag, seasonal affective disorder, and depression. And they warn that although new drugs are being promoted to allow us to stay awake for longer periods, a 24/7 lifestyle can have a harmful impact on our health, both as individuals and as a society.…

  • Idioma: Inglés

    Editorial: Yale University Press, 2005

    0300109695 / 9780300109696

    • Tapa blanda

    Librería: Zoom Books Company, Lynden, WA, Estados Unidos de AmericaZoom Books Company

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Bueno

    EUR 4,23

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 2 disponibles

    Condición: very_good. Book is in very good condition and may include minimal underlining highlighting. The book can also include "From the library of" labels. May not contain miscellaneous items toys, dvds, etc. . We offer 100% money back guarantee and 24 7 customer service.

  • Idioma: Inglés

    Editorial: Yale University Press, 2005

    0300109695 / 9780300109696

    • Tapa blanda

    Librería: ZBK Books, Carlstadt, NJ, Estados Unidos de AmericaZBK Books

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Bueno

    EUR 5,09

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Condición: very_good. Fast & Free Shipping â" Very Good condition book with a firm cover and clean pages. Shows normal use and some light wear or limited notes markings. A solid, nice copy to enjoy.

  • Idioma: Inglés

    Editorial: Yale University Press, 2005

    0300109695 / 9780300109696

    • Tapa blanda

    Librería: World of Books Inc, Montgomery, IL, Estados Unidos de AmericaWorld of Books Inc

    Vendedor de 4 estrellas
    Contactar con el vendedor

    Condición: Usado - Aceptable

    EUR 6,06

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 2 disponibles

    Paperback. Condición: Good. Why can't teenagers get out of bed in the morning? How do bees tell the time? Why do some plants open and close their flowers at the same time each day? Why do so many people suffer the misery of jet lag? In this fascinating book, Russell Foster and Leon Kreitzman explain the significance of the biological clock, showing how it has played an essential role in evolution and why it continues to play a vitally important role in all living organisms. The authors tell us that biological clocks are embedded in our genes and reset at sunrise and sunset each day to link astronomical time with an organism's internal time. They discuss how scientists are working out the clockwork mechanisms and what governs them, and they describe how organisms measure different intervals of time, how they are adapted to various cycles, and how light coordinates the time within to the external world. They review problems that can be caused by malfunctioning biological clocks-including jet lag, seasonal affective disorder, and depression. And they warn that although new drugs are being promoted to allow us to stay awake for longer periods, a 24/7 lifestyle can have a harmful impact on our health, both as individuals and as a society.…

  • Idioma: Inglés

    Editorial: Yale University Press, 2005

    0300109695 / 9780300109696

    • Tapa blanda

    Librería: World of Books Inc, Montgomery, IL, Estados Unidos de AmericaWorld of Books Inc

    Vendedor de 4 estrellas
    Contactar con el vendedor

    Condición: Usado - Regular

    EUR 6,06

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Paperback. Condición: Fair. Why can't teenagers get out of bed in the morning? How do bees tell the time? Why do some plants open and close their flowers at the same time each day? Why do so many people suffer the misery of jet lag? In this fascinating book, Russell Foster and Leon Kreitzman explain the significance of the biological clock, showing how it has played an essential role in evolution and why it continues to play a vitally important role in all living organisms. The authors tell us that biological clocks are embedded in our genes and reset at sunrise and sunset each day to link astronomical time with an organism's internal time. They discuss how scientists are working out the clockwork mechanisms and what governs them, and they describe how organisms measure different intervals of time, how they are adapted to various cycles, and how light coordinates the time within to the external world. They review problems that can be caused by malfunctioning biological clocks-including jet lag, seasonal affective disorder, and depression. And they warn that although new drugs are being promoted to allow us to stay awake for longer periods, a 24/7 lifestyle can have a harmful impact on our health, both as individuals and as a society.…

  • Idioma: Inglés

    Editorial: Yale University Press, 2004

    0300105746 / 9780300105742

    • Tapa dura

    Librería: World of Books (was SecondSale), Montgomery, IL, Estados Unidos de AmericaWorld of Books (was SecondSale)

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Aceptable

    EUR 6,15

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Hardback. Condición: Good. The significance of the biological clock is explained in this study, which describes how biological clocks are embedded in genes and reset at sunrise and sunset every day, and reviews problems resulting from biological clocks, such as jet lag, seasonal affective disorder, and depression. …

  • Idioma: Inglés

    Editorial: Yale University Press (edition 1), 2004

    0300105746 / 9780300105742

    • Tapa dura

    Librería: BooksRun, Philadelphia, PA, Estados Unidos de AmericaBooksRun

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Bueno

    EUR 6,16

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Hardcover. Condición: Very Good. 1. With dust jacket. It's a well-cared-for item that has seen limited use. The item may show minor signs of wear. All the text is legible, with all pages included. It may have slight markings and/or highlighting.

  • Idioma: Inglés

    Editorial: Yale University Press, 2005

    0300109695 / 9780300109696

    • Tapa blanda

    Librería: ThriftBooks-Reno, Reno, NV, Estados Unidos de AmericaThriftBooks-Reno

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Bueno

    EUR 6,22

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Paperback. Condición: Very Good. No Jacket. May have limited writing in cover pages. Pages are unmarked. ~ ThriftBooks: Read More, Spend Less.

  • Idioma: Inglés

    Editorial: Yale University Press, 2005

    0300109695 / 9780300109696

    • Tapa blanda

    Librería: ThriftBooks-Atlanta, AUSTELL, GA, Estados Unidos de AmericaThriftBooks-Atlanta

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Regular

    EUR 6,24

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Paperback. Condición: Fair. No Jacket. Readable copy. Pages may have considerable notes/highlighting. ~ ThriftBooks: Read More, Spend Less.

  • Idioma: Inglés

    Editorial: Yale University Press, 2005

    0300109695 / 9780300109696

    • Tapa blanda

    Librería: ThriftBooks-Atlanta, AUSTELL, GA, Estados Unidos de AmericaThriftBooks-Atlanta

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Bueno

    EUR 6,24

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Paperback. Condición: Very Good. No Jacket. May have limited writing in cover pages. Pages are unmarked. ~ ThriftBooks: Read More, Spend Less.

  • Idioma: Inglés

    Editorial: Yale University Press, 2005

    0300109695 / 9780300109696

    • Tapa blanda

    Librería: ThriftBooks-Dallas, Dallas, TX, Estados Unidos de AmericaThriftBooks-Dallas

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Aceptable

    EUR 6,24

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Paperback. Condición: Good. No Jacket. Pages can have notes/highlighting. Spine may show signs of wear. ~ ThriftBooks: Read More, Spend Less.

  • Idioma: Inglés

    Editorial: Yale University Press, 2005

    0300109695 / 9780300109696

    • Tapa blanda

    Librería: ThriftBooks-Atlanta, AUSTELL, GA, Estados Unidos de AmericaThriftBooks-Atlanta

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Aceptable

    EUR 6,24

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Paperback. Condición: Good. No Jacket. Pages can have notes/highlighting. Spine may show signs of wear. ~ ThriftBooks: Read More, Spend Less.

  • Idioma: Inglés

    Editorial: Yale University Press, 2005

    0300109695 / 9780300109696

    • Tapa blanda

    Librería: ThriftBooks-Dallas, Dallas, TX, Estados Unidos de AmericaThriftBooks-Dallas

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Bueno

    EUR 6,24

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Paperback. Condición: Very Good. No Jacket. May have limited writing in cover pages. Pages are unmarked. ~ ThriftBooks: Read More, Spend Less.

  • Idioma: Inglés

    Editorial: U-Bild Newspaper Syndicate, 1983

    0910495033 / 9780910495035

    • Tapa blanda

    Librería: -OnTimeBooks-, Phoenix, AZ, Estados Unidos de America-OnTimeBooks-

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Bueno

    EUR 6,29

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Condición: very_good. Gently read. May have name of previous ownership, or ex-library edition. Binding tight; spine straight and smooth, with no creasing; covers clean and crisp. Minimal signs of handling or shelving. 100% GUARANTEE! Shipped with delivery confirmation, if you're not satisfied with purchase please return item! Ships USPS Media Mail.…

  • Idioma: Inglés

    Editorial: Yale University Press, 2004

    0300105746 / 9780300105742

    • Tapa dura
    • Primera edición

    Librería: Better World Books: West, Reno, NV, Estados Unidos de AmericaBetter World Books: West

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Bueno

    EUR 6,35

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Condición: Very Good. 1st Edition. Pages intact with possible writing/highlighting. Binding strong with minor wear. Dust jackets/supplements may not be included. Stock photo provided. Product includes identifying sticker. Better World Books: Buy Books. Do Good.

  • Idioma: Inglés

    Editorial: Yale University Press, 2004

    0300105746 / 9780300105742

    • Tapa dura
    • Primera edición

    Librería: Better World Books, Mishawaka, IN, Estados Unidos de AmericaBetter World Books

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Bueno

    EUR 6,35

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Condición: Very Good. 1st Edition. Former library copy. Pages intact with possible writing/highlighting. Binding strong with minor wear. Dust jackets/supplements may not be included. Includes library markings. Stock photo provided. Product includes identifying sticker. Better World Books: Buy Books. Do Good. …

  • Idioma: Inglés

    Editorial: U-Bild Newspaper Syndicate, 1983

    0910495033 / 9780910495035

    • Tapa blanda

    Librería: -OnTimeBooks-, Phoenix, AZ, Estados Unidos de America-OnTimeBooks-

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Aceptable

    EUR 6,43

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 2 disponibles

    Condición: good. A copy that has been read, remains in good condition. All pages are intact, and the cover is intact. The spine and cover show signs of wear. Pages can include notes and highlighting and show signs of wear, and the copy can include "From the library of" labels or previous owner inscriptions. 100% GUARANTEE! Shipped with delivery confirmation, if you're not satisfied with purchase please return item! Ships via media mail.…

  • Idioma: Inglés

    Editorial: Yale University Press, 2004

    0300105746 / 9780300105742

    • Tapa dura

    Librería: ThriftBooks-Dallas, Dallas, TX, Estados Unidos de AmericaThriftBooks-Dallas

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Aceptable

    EUR 6,45

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Hardcover. Condición: Good. No Jacket. Former library book; Pages can have notes/highlighting. Spine may show signs of wear. ~ ThriftBooks: Read More, Spend Less.

  • Idioma: Inglés

    Editorial: Yale University Press, 2004

    0300105746 / 9780300105742

    • Tapa dura

    Librería: ThriftBooks-Reno, Reno, NV, Estados Unidos de AmericaThriftBooks-Reno

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Bueno

    EUR 6,45

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Hardcover. Condición: Very Good. No Jacket. Former library book; May have limited writing in cover pages. Pages are unmarked. ~ ThriftBooks: Read More, Spend Less.

  • Idioma: Inglés

    Editorial: Yale University Press, 2004

    0300105746 / 9780300105742

    • Tapa dura

    Librería: ThriftBooks-Dallas, Dallas, TX, Estados Unidos de AmericaThriftBooks-Dallas

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Bueno

    EUR 6,45

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Hardcover. Condición: Very Good. No Jacket. Former library book; May have limited writing in cover pages. Pages are unmarked. ~ ThriftBooks: Read More, Spend Less.

  • Idioma: Inglés

    Editorial: Yale University Press, 2004

    0300105746 / 9780300105742

    • Tapa dura

    Librería: ThriftBooks-Atlanta, AUSTELL, GA, Estados Unidos de AmericaThriftBooks-Atlanta

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Bueno

    EUR 6,45

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Hardcover. Condición: Very Good. No Jacket. Former library book; May have limited writing in cover pages. Pages are unmarked. ~ ThriftBooks: Read More, Spend Less.

  • Idioma: Inglés

    Editorial: Yale University Press, 2005

    0300109695 / 9780300109696

    • Tapa blanda

    Librería: Better World Books: West, Reno, NV, Estados Unidos de AmericaBetter World Books: West

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Bueno

    EUR 6,57

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Condición: Very Good. 1 Edition. Former library copy. Pages intact with possible writing/highlighting. Binding strong with minor wear. Dust jackets/supplements may not be included. Includes library markings. Stock photo provided. Product includes identifying sticker. Better World Books: Buy Books. Do Good. …

  • Idioma: Inglés

    Editorial: Yale University Press, 2005

    0300109695 / 9780300109696

    • Tapa blanda

    Librería: Better World Books, Mishawaka, IN, Estados Unidos de AmericaBetter World Books

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Aceptable

    EUR 6,57

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Condición: Good. 1 Edition. Former library copy. Pages intact with minimal writing/highlighting. The binding may be loose and creased. Dust jackets/supplements are not included. Includes library markings. Stock photo provided. Product includes identifying sticker. Better World Books: Buy Books. Do Good.…

  • Idioma: Inglés

    Editorial: Yale University Press, 2005

    0300109695 / 9780300109696

    • Tapa blanda

    Librería: Better World Books, Mishawaka, IN, Estados Unidos de AmericaBetter World Books

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Aceptable

    EUR 6,57

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Condición: Good. 1 Edition. Pages intact with minimal writing/highlighting. The binding may be loose and creased. Dust jackets/supplements are not included. Stock photo provided. Product includes identifying sticker. Better World Books: Buy Books. Do Good.

  • Idioma: Inglés

    Editorial: Knopf, 1971

    0394416953 / 9780394416953

    • Tapa dura

    Librería: ThriftBooks-Dallas, Dallas, TX, Estados Unidos de AmericaThriftBooks-Dallas

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Regular

    EUR 6,78

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Hardcover. Condición: Fair. No Jacket. Former library book; Readable copy. Pages may have considerable notes/highlighting. ~ ThriftBooks: Read More, Spend Less.

  • Idioma: Inglés

    Editorial: Knopf, 1971

    0394416953 / 9780394416953

    • Tapa dura

    Librería: ThriftBooks-Dallas, Dallas, TX, Estados Unidos de AmericaThriftBooks-Dallas

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Aceptable

    EUR 6,78

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Hardcover. Condición: Good. No Jacket. Pages can have notes/highlighting. Spine may show signs of wear. ~ ThriftBooks: Read More, Spend Less.

  • Idioma: Inglés

    Editorial: Random House Children's Books, 1971

    0394416953 / 9780394416953

    • Tapa dura
    • Primera edición

    Librería: Better World Books, Mishawaka, IN, Estados Unidos de AmericaBetter World Books

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Aceptable

    EUR 6,78

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 4 disponibles

    Condición: Good. 1st. Former library copy. Pages intact with minimal writing/highlighting. The binding may be loose and creased. Dust jackets/supplements are not included. Includes library markings. Stock photo provided. Product includes identifying sticker. Better World Books: Buy Books. Do Good.

  • Idioma: Inglés

    Editorial: Profile Books Ltd, 2004

    1861972350 / 9781861972354

    • Tapa dura

    Librería: World of Books (was SecondSale), Montgomery, IL, Estados Unidos de AmericaWorld of Books (was SecondSale)

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Aceptable

    EUR 7,44

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Hardback. Condición: Good. Popular science at its most exciting: the breaking new world of chronobiology - understanding the rhythm of life in humans and all plants and animals. The entire natural world is full of rhythms. The early bird catches the worm -and migrates to an internal calendar. Dormice hibernate away the winter. Plants open and close their flowers at the same hour each day. Bees search out nectar-rich flowers day after day. There are cicadas that can breed for only two weeks every 17 years. And in humans: why are people who work anti-social shifts more illness prone and die younger? What is jet-lag and can anything help? Why do teenagers refuse to get up in the morning, and are the rest of us really 'larks' or 'owls'? Why are most people born (and die) between 3am-5am? And should patients be given medicines (and operations) at set times of day, because the body reacts so differently in the morning, evening and at night? The answers lie in our biological clocks the mechanisms which give order to all living things. They impose a structure that enables us to change our behaviour in relation to the time of day, month or year. They are reset at sunrise and sunset each day to link astronomical time with an organism's internal time. Illustrated (ilustrador). …

  • Idioma: Inglés

    Editorial: Profile Books Ltd, 2004

    1861972350 / 9781861972354

    • Tapa dura

    Librería: World of Books (was SecondSale), Montgomery, IL, Estados Unidos de AmericaWorld of Books (was SecondSale)

    Vendedor de 5 estrellas
    Contactar con el vendedor

    Condición: Usado - Bueno

    EUR 7,44

     Gastos de envío gratis 
    Se envía dentro de Estados Unidos de America

    Cantidad disponible: 1 disponible

    Hardback. Condición: Very Good. Popular science at its most exciting: the breaking new world of chronobiology - understanding the rhythm of life in humans and all plants and animals. The entire natural world is full of rhythms. The early bird catches the worm -and migrates to an internal calendar. Dormice hibernate away the winter. Plants open and close their flowers at the same hour each day. Bees search out nectar-rich flowers day after day. There are cicadas that can breed for only two weeks every 17 years. And in humans: why are people who work anti-social shifts more illness prone and die younger? What is jet-lag and can anything help? Why do teenagers refuse to get up in the morning, and are the rest of us really 'larks' or 'owls'? Why are most people born (and die) between 3am-5am? And should patients be given medicines (and operations) at set times of day, because the body reacts so differently in the morning, evening and at night? The answers lie in our biological clocks the mechanisms which give order to all living things. They impose a structure that enables us to change our behaviour in relation to the time of day, month or year. They are reset at sunrise and sunset each day to link astronomical time with an organism's internal time. Illustrated (ilustrador). …