Physique relativiste Livres audio

Livre audio

Something Deeply Hidden

Quantum Worlds and the Emergence of Spacetime

par Sean Carroll ...

Lu par Sean Carroll ...

Version Longue

10 heure 9 min

**INSTANT NEW YORK TIMES BESTSELLERAs you read these words, copies of you are being created.**Sean Carroll, theoretical physicist and one of this world’s most celebrated writers on science, rewrites the history of 20th century physics. Already hailed as a masterpiece, Something Deeply Hidden shows for the first time that facing up to the essential puzzle of quantum mechanics utterly transforms how ... En savoir plus

$29.99 CAD

**INSTANT NEW YORK TIMES BESTSELLERAs you read these words, copies of you are being created.**Sean Carroll, theoretical physicist and one of this world’s most celebrated writers on science, rewrites the history of 20th century physics. Already hailed as a masterpiece, Something Deeply Hidden shows for the first time that facing up to the essential puzzle of quantum mechanics utterly transforms how
... En savoir plus
Livre audio

Einstein

His Life and Universe

par Walter Isaacson ...

Lu par Edward Herrmann ...

Version Longue

21 heure 31 min

Winner of the 2008 Audie Award for Biography/MemoirThe definitive, internationally bestselling biography of Albert Einstein. Now the basis of Genius, the ten-part National Geographic series on the life of Albert Einstein, starring the Oscar, Emmy, and Tony Award–winning actor Geoffrey Rush as Einstein.How did his mind work? What made him a genius? Isaacson’s biography shows how Einstein’s ... En savoir plus

$46.99 CAD

Winner of the 2008 Audie Award for Biography/MemoirThe definitive, internationally bestselling biography of Albert Einstein. Now the basis of Genius, the ten-part National Geographic series on the life of Albert Einstein, starring the Oscar, Emmy, and Tony Award–winning actor Geoffrey Rush as Einstein.How did his mind work? What made him a genius? Isaacson’s biography shows how Einstein’s
... En savoir plus
Livre audio

Helgoland

Making Sense of the Quantum Revolution

par Carlo Rovelli ...

Lu par David Rintoul ...

Version Longue

4 heure 31 min

**Named a Best Book of 2021 by the Financial Times and a Best Science Book of 2021 by The Guardian“Rovelli is a genius and an amazing communicator… This is the place where science comes to life.” ―Neil Gaiman“One of the warmest, most elegant and most lucid interpreters to the laity of the dazzling enigmas of his discipline...[a] momentous book” ―John Banville, The Wall Street Journal**A startling ... En savoir plus

$20.99 CAD

**Named a Best Book of 2021 by the Financial Times and a Best Science Book of 2021 by The Guardian“Rovelli is a genius and an amazing communicator… This is the place where science comes to life.” ―Neil Gaiman“One of the warmest, most elegant and most lucid interpreters to the laity of the dazzling enigmas of his discipline...[a] momentous book” ―John Banville, The Wall Street Journal**A startling
... En savoir plus
Livre audio

The Biggest Ideas in the Universe

Space, Time, and Motion

par Sean Carroll ...

Lu par Sean Carroll ...

Version Longue

9 heure 55 min

"A porthole into another world."—Scientific AmericanThe most trusted explainer of the most mind-boggling concepts pulls back the veil of mystery that has too long cloaked the most valuable building blocks of modern science. Sean Carroll, with his genius for making complex notions entertaining, presents in his uniquely lucid voice the fundamental ideas informing the modern physics of reality ... En savoir plus

$27.99 CAD

"A porthole into another world."—Scientific AmericanThe most trusted explainer of the most mind-boggling concepts pulls back the veil of mystery that has too long cloaked the most valuable building blocks of modern science. Sean Carroll, with his genius for making complex notions entertaining, presents in his uniquely lucid voice the fundamental ideas informing the modern physics of reality
... En savoir plus
Livre audio

Hyperspace

A Scientific Odyssey Through Parallel Universes, Time Warps, and the 10th Dimension

par Michio Kaku ...

Lu par Tim Lounibos ...

Version Longue

14 heure 12 min

Are there other dimensions beyond our own? Is time travel possible? Can we change the past? Are there gateways to parallel universes? All of us have pondered such questions, but there was a time when scientists dismissed these notions as outlandish speculations. Not any more. Today, they are the focus of the most intense scientific activity in recent memory. In Hyperspace, Michio Kaku offers the ... En savoir plus

$35.27 CAD

Are there other dimensions beyond our own? Is time travel possible? Can we change the past? Are there gateways to parallel universes? All of us have pondered such questions, but there was a time when scientists dismissed these notions as outlandish speculations. Not any more. Today, they are the focus of the most intense scientific activity in recent memory. In Hyperspace, Michio Kaku offers the
... En savoir plus
Livre audio

White Holes

par Carlo Rovelli ...

Lu par Harry Lloyd ...

Version Longue

2 heure 48 min

A mesmerizing trip to the strange world of white holes from the bestselling author of Seven Brief Lessons on Physics and The Order of TimeLet us journey, with beloved physicist Carlo Rovelli, into the heart of a black hole. We slip beyond its horizon and tumble down this crack in the universe. As we plunge, we see geometry fold. Time and space pull and stretch. And finally, at the black hole’s ... En savoir plus

$20.99 CAD

A mesmerizing trip to the strange world of white holes from the bestselling author of Seven Brief Lessons on Physics and The Order of TimeLet us journey, with beloved physicist Carlo Rovelli, into the heart of a black hole. We slip beyond its horizon and tumble down this crack in the universe. As we plunge, we see geometry fold. Time and space pull and stretch. And finally, at the black hole’s
... En savoir plus
Livre audio

Gravity’s Century

From Einstein’s Eclipse to Images of Black Holes

par Ron Cowen ...

Lu par John Patrick Walsh ...

Version Longue

4 heure 58 min

A sweeping account of the century of experimentation that confirmed Einstein’s general theory of relativity, bringing to life the science and scientists at the origins of relativity, the development of radio telescopes, the discovery of black holes and quasars, and the still unresolved place of gravity in quantum theory.Albert Einstein did nothing of note on May 29, 1919; yet that is when he ... En savoir plus

$27.08 CAD ou Gratuit avec Kobo Plus

A sweeping account of the century of experimentation that confirmed Einstein’s general theory of relativity, bringing to life the science and scientists at the origins of relativity, the development of radio telescopes, the discovery of black holes and quasars, and the still unresolved place of gravity in quantum theory.Albert Einstein did nothing of note on May 29, 1919; yet that is when he
... En savoir plus
Livre audio

Quantenlicht

Das Jahrzehnt der Physik 1919-1929

par Thomas de Padova ...

Lu par Michael J. Diekmann ...

Version Longue

13 heure 38 min

Vier Forscher und ein unablässiges Hin und Her der Ideen – vor hundert Jahren entstand eine neue Wissenschaft, die die Grenzen der Vorstellungskraft sprengte: die Quantenphysik. Ihre Protagonisten: Max Planck, Albert Einstein, Niels Bohr und Werner Heisenberg. Sie ergründeten das Innere der Atome und rangen mit einer scheinbar einfachen Frage: Was ist Licht? – zu einer Zeit, in der Elektrizität ... En savoir plus

$33.99 CAD

Vier Forscher und ein unablässiges Hin und Her der Ideen – vor hundert Jahren entstand eine neue Wissenschaft, die die Grenzen der Vorstellungskraft sprengte: die Quantenphysik. Ihre Protagonisten: Max Planck, Albert Einstein, Niels Bohr und Werner Heisenberg. Sie ergründeten das Innere der Atome und rangen mit einer scheinbar einfachen Frage: Was ist Licht? – zu einer Zeit, in der Elektrizität
... En savoir plus
Livre audio

Was ist Materie?

Originaltonaufnahmen 1949/1952

par Erwin Schrödinger ...

Lu par Erwin Schrödinger ...

Version Longue

1 heures 25 min

Der Wiener Physiker Erwin Schrödinger (1887-1961) leistete bahnbrechende Arbeiten zur Wellenmechanik und Quantentheorie, für die er unter anderem mit dem Nobelpreis ausgezeichnet wurde. Untrennbar mit seinem Namen verbunden sind die von ihm entdeckte "Schrödinger-Gleichung" sowie sein berühmtes Gedankenexperiment "Schrödinger's Katze". Die vorliegende Audio-Edition versammelt die beiden einzigen ... En savoir plus

$24.99 CAD ou Gratuit avec Kobo Plus

Der Wiener Physiker Erwin Schrödinger (1887-1961) leistete bahnbrechende Arbeiten zur Wellenmechanik und Quantentheorie, für die er unter anderem mit dem Nobelpreis ausgezeichnet wurde. Untrennbar mit seinem Namen verbunden sind die von ihm entdeckte "Schrödinger-Gleichung" sowie sein berühmtes Gedankenexperiment "Schrödinger's Katze". Die vorliegende Audio-Edition versammelt die beiden einzigen
... En savoir plus
Livre audio

Three Roads to Quantum Gravity

par Lee Smolin ...

Lu par L.J. Ganser ...

Collections series Science Masters
Version Longue

8 heure 39 min

In Three Roads to Quantum Gravity, Lee Smolin provides an accessible overview of the attempts to build a final "theory of everything." He explains in simple terms what scientists are talking about when they say the world is made from exotic entities such as loops, strings, and black holes and tells the fascinating stories behind these discoveries: the rivalries, epiphanies, and intrigues he ... En savoir plus

$27.99 CAD

In Three Roads to Quantum Gravity, Lee Smolin provides an accessible overview of the attempts to build a final "theory of everything." He explains in simple terms what scientists are talking about when they say the world is made from exotic entities such as loops, strings, and black holes and tells the fascinating stories behind these discoveries: the rivalries, epiphanies, and intrigues he
... En savoir plus
Livre audio

Where the Universe Came From

How Einstein's relativity unlocks the past, present and future of the cosmos

par New Scientist ...

Lu par Mark Elstob ...

Collections series New Scientist Instant Expert
Version Longue

4 heure 23 min

How did it all begin? Where is it all going?A little over a century ago, a young Albert Einstein presented his general theory of relativity to the world and utterly transformed our understanding of the universe. His theory changed the way we think about space and time, revealed how our universe has been expanding from a hot dense state called the big bang and predicted black holes.WHERE THE ... En savoir plus

$34.99 CAD

How did it all begin? Where is it all going?A little over a century ago, a young Albert Einstein presented his general theory of relativity to the world and utterly transformed our understanding of the universe. His theory changed the way we think about space and time, revealed how our universe has been expanding from a hot dense state called the big bang and predicted black holes.WHERE THE
... En savoir plus
Livre audio

Relativität - Zeit, Raum und das Sein

Physik leicht erklärt Band 2

par Orhan Schöwe ...

Lu par Orhan Schöwe ...

Collections Livre audio : 2 - Physik leicht erklärt
Version Longue

35 min

Relativität – Zeit, Raum und das Sein(Physik leicht erklärt | Band 2)Was bleibt von der Wirklichkeit, wenn Zeit nicht für alle gleich vergehtund Raum kein fester Hintergrund mehr ist?In diesem Hörbuch nimmt dich Orhan Schöwe mit auf eine ruhige, erzählerische Reise durch Einsteins Relativitätstheorie – nicht als abstraktes Konzept, sondern als Erfahrung. Schritt für Schritt zeigt er, wie Bewegung, ... En savoir plus

$7.99 CAD ou Gratuit avec Kobo Plus

Relativität – Zeit, Raum und das Sein(Physik leicht erklärt | Band 2)Was bleibt von der Wirklichkeit, wenn Zeit nicht für alle gleich vergehtund Raum kein fester Hintergrund mehr ist?In diesem Hörbuch nimmt dich Orhan Schöwe mit auf eine ruhige, erzählerische Reise durch Einsteins Relativitätstheorie – nicht als abstraktes Konzept, sondern als Erfahrung. Schritt für Schritt zeigt er, wie Bewegung,
... En savoir plus
Livre audio

The Perfect Theory

A Century of Geniuses and the Battle over General Relativity

par Pedro G. Ferreira ...

Lu par Sean Runnette ...

Version Longue

10 heure 23 min

How did one elegant theory incite a scientific revolution?Physicists have been exploring, debating, and questioning the general theory of relativity ever since Albert Einstein first presented it in 1915. Their work has uncovered a number of the universe's more surprising secrets, and many believe further wonders remain hidden within the theory's tangle of equations, waiting to be exposed. In this ... En savoir plus

$32.15 CAD

How did one elegant theory incite a scientific revolution?Physicists have been exploring, debating, and questioning the general theory of relativity ever since Albert Einstein first presented it in 1915. Their work has uncovered a number of the universe's more surprising secrets, and many believe further wonders remain hidden within the theory's tangle of equations, waiting to be exposed. In this
... En savoir plus
Livre audio

Einstein in Time and Space

A Life in 99 Particles

par Samuel Graydon ...

Lu par George Reid ...

Version Longue

9 heure 5 min

Walter Isaacson’s Einstein meets Craig Brown’s 99 Glimpses of Princess Margaret, in this engaging and innovative biography of the famous physicist told in ninety-nine dazzling vignettes.Most of us would agree that Albert Einstein’s name is synonymous with “genius” and that his likeness is often used as a shorthand for all scientists, appearing everywhere from cartoons to textbooks. He has become ... En savoir plus

$34.99 CAD

Walter Isaacson’s Einstein meets Craig Brown’s 99 Glimpses of Princess Margaret, in this engaging and innovative biography of the famous physicist told in ninety-nine dazzling vignettes.Most of us would agree that Albert Einstein’s name is synonymous with “genius” and that his likeness is often used as a shorthand for all scientists, appearing everywhere from cartoons to textbooks. He has become
... En savoir plus
Livre audio

Janus Point, The

A New Theory of Time

par Julian Barbour ...

Lu par James Langton ...

Version Longue

13 heure 45 min

In a universe filled by chaos and disorder, one physicist makes the radical argument that the growth of order drives the passage of time -- and shapes the destiny of the universe.Time is among the universe's greatest mysteries. Why, when most laws of physics allow for it to flow forward and backward, does it only go forward? Physicists have long appealed to the second law of thermodynamics, held ... En savoir plus

$58.35 CAD

In a universe filled by chaos and disorder, one physicist makes the radical argument that the growth of order drives the passage of time -- and shapes the destiny of the universe.Time is among the universe's greatest mysteries. Why, when most laws of physics allow for it to flow forward and backward, does it only go forward? Physicists have long appealed to the second law of thermodynamics, held
... En savoir plus
Livre audio

Laws of Nature

par J.-M. Kuczynski ...

Lu par J.-M. Kuczynski ...

Version Longue

16 min

It is made clear what laws of nature are and what role they have in scientific practice. ... En savoir plus

$1.99 CAD ou Gratuit avec Kobo Plus

It is made clear what laws of nature are and what role they have in scientific practice.
... En savoir plus
Livre audio

This Way to the Universe

A Theoretical Physicist's Journey to the Edge of Reality

par Michael Dine ...

Lu par Michael Dine ...

Version Longue

8 heure 56 min

For readers of Sean Carroll, Brian Greene, Katie Mack, and anyone who wants to know what theoretical physicists actually do.This Way to the Universe is a celebration of the astounding, ongoing scientific investigations that have revealed the nature of reality at its smallest, at its largest, and at the scale of our daily lives. The enigmas that Professor Michael Dine discusses are like landmarks ... En savoir plus

$27.99 CAD

For readers of Sean Carroll, Brian Greene, Katie Mack, and anyone who wants to know what theoretical physicists actually do.This Way to the Universe is a celebration of the astounding, ongoing scientific investigations that have revealed the nature of reality at its smallest, at its largest, and at the scale of our daily lives. The enigmas that Professor Michael Dine discusses are like landmarks
... En savoir plus
Livre audio

Ripples in Spacetime

Einstein, Gravitational Waves, and the Future of Astronomy

par Govert Schilling ...

Lu par Joel Richards ...

Version Longue

11 heure 30 min

Ripples in Spacetime is an engaging account of the international effort to complete Einstein's project, capture his elusive ripples, and launch an era of gravitational-wave astronomy that promises to explain, more vividly than ever before, our universe’s structure and origin.The quest for gravitational waves involved years of risky research and many personal and professional struggles that ... En savoir plus

$27.99 CAD

Ripples in Spacetime is an engaging account of the international effort to complete Einstein's project, capture his elusive ripples, and launch an era of gravitational-wave astronomy that promises to explain, more vividly than ever before, our universe’s structure and origin.The quest for gravitational waves involved years of risky research and many personal and professional struggles that
... En savoir plus
Livre audio

Gravasterne - Die Alternative zu Schwarzen Löchern

Gravasterne könnten unser Verständnis des Universums verändern

par Wissen in Minuten ...

Lu par Wissen in Minuten ...

Version Longue

10 min

Schwarze Löcher sind die extremsten Objekte des Kosmos – und trotzdem haben sie ein paar richtig unangenehme Probleme. Genau hier kommt eine verrückte Idee ins Spiel: Gravasterne. Sie könnten wie Schwarze Löcher aussehen, aber ohne einige der paradoxen Konsequenzen.In diesem kurzen Hörbuch erfährst du, was Gravasterne überhaupt sein sollen, wie sie theoretisch entstehen könnten und warum sie für ... En savoir plus

$2.99 CAD ou Gratuit avec Kobo Plus

Schwarze Löcher sind die extremsten Objekte des Kosmos – und trotzdem haben sie ein paar richtig unangenehme Probleme. Genau hier kommt eine verrückte Idee ins Spiel: Gravasterne. Sie könnten wie Schwarze Löcher aussehen, aber ohne einige der paradoxen Konsequenzen.In diesem kurzen Hörbuch erfährst du, was Gravasterne überhaupt sein sollen, wie sie theoretisch entstehen könnten und warum sie für
... En savoir plus
Livre audio

Time, Dimensions, and Quantum Mechanical Bundle, The

par Martin K. Ettington ...

Lu par Martin K. Ettington ...

Version Longue

7 heure 47 min

This is a bundle of five books all about Time, Dimensions, and Quantum Mechanical PhenomenaQuantum Mechanics, Technology, Consciousness, and the MultiverseHow Quantum Mechanics affects our lives with new technology and also how consciousness itself maybe a quantum wave. Also discusses spiritual abilities which have quantum aspects too. Finally, the quantum aspects of the multiverse. Real Time ... En savoir plus

$27.99 CAD ou Gratuit avec Kobo Plus

This is a bundle of five books all about Time, Dimensions, and Quantum Mechanical PhenomenaQuantum Mechanics, Technology, Consciousness, and the MultiverseHow Quantum Mechanics affects our lives with new technology and also how consciousness itself maybe a quantum wave. Also discusses spiritual abilities which have quantum aspects too. Finally, the quantum aspects of the multiverse. Real Time
... En savoir plus
Livre audio

The Physicist Albert Einstein - Life and Works of the Founder of the Theory of Relativity and the Best-Known Scientific Genius and Pacifist - Global Basics 101 - Your Series for Modern Knowledge, Folge 14 (ungekürzt)

par Bert Alexander Petzold, Bert Alexander Petzold ...

Lu par unnamed ...

Version Longue

1 heures 55 min

Anyone who knows Albert Einstein only as a tousle haired face on a poster has seen only the surface. How could a physicist so fundamentally change the Newtonian view of the world that time and space suddenly became mobile and the twentieth century learned a new way of thinking. This non fiction book shows why Einstein, as the originator of the theory of relativity, became the very image of the ... En savoir plus

$7.99 CAD

Anyone who knows Albert Einstein only as a tousle haired face on a poster has seen only the surface. How could a physicist so fundamentally change the Newtonian view of the world that time and space suddenly became mobile and the twentieth century learned a new way of thinking. This non fiction book shows why Einstein, as the originator of the theory of relativity, became the very image of the
... En savoir plus
Livre audio

Relativity - Time, Space, and Being

Physics Explained Simply - Volume 2

par Orhan Schöwe ...

Lu par Eleven Labs Digital Voice ...

Collections Livre audio : 2 - Physics Explained Simply
Version Longue

34 min

Relativity – Time, Space, and Being(Physics Explained Simply | Volume 2)What remains of realitywhen time no longer flows equally for everyoneand space is no longer a fixed background?In this audiobook, Orhan Schöwe invites you on a calm, narrative journey through Einstein’s theory of relativity — not as an abstract concept, but as an experience. Step by step, he reveals how motion, light, and ... En savoir plus

$7.45 CAD ou Gratuit avec Kobo Plus

Relativity – Time, Space, and Being(Physics Explained Simply | Volume 2)What remains of realitywhen time no longer flows equally for everyoneand space is no longer a fixed background?In this audiobook, Orhan Schöwe invites you on a calm, narrative journey through Einstein’s theory of relativity — not as an abstract concept, but as an experience. Step by step, he reveals how motion, light, and
... En savoir plus
Livre audio

Spacetime - How the Universe Learns to Think

Physics Explained Simply - Volume 3

par Orhan Schoewe ...

Lu par Orhan Schoewe ...

Collections Livre audio : 3 - Physics Explained Simply
Version Longue

34 min

Spacetime – How the Universe Learns to Think(Physics Explained Simply | Volume 3)What is spacetime, really?A fixed framework of space and time — or a living fabric that connects motion, energy, and perception?In Volume 3 of the Physics Explained Simply series, Orhan Schöwe explores one of the deepest concepts of modern physics: spacetime. This audiobook explains, clearly and without formulas, how ... En savoir plus

$7.45 CAD ou Gratuit avec Kobo Plus

Spacetime – How the Universe Learns to Think(Physics Explained Simply | Volume 3)What is spacetime, really?A fixed framework of space and time — or a living fabric that connects motion, energy, and perception?In Volume 3 of the Physics Explained Simply series, Orhan Schöwe explores one of the deepest concepts of modern physics: spacetime. This audiobook explains, clearly and without formulas, how
... En savoir plus
Livre audio

3分鐘讀懂霍金（有聲書）：進入霍金人生、理論、影響的時空旅程

3-Minute Stephen Hawking: His Life theories and Influence in 3-minute particles

par 保羅‧派森斯;蓋爾‧迪克森 ...

Lu par 謝立品 ...

Version Longue

4 heure 49 min

「我的志向很單純。徹底了解我們的宇宙，為什麼它是現在這個模樣？為什麼它會存在？」──史蒂芬‧霍金你是否買了一本《時間簡史》，但總是撐不過第二頁？你是否覺得「黑洞」是個很迷人，卻又太神祕的字詞？你是否也對這位家喻戶曉、擁有電腦合成嗓音的天才充滿好奇？史蒂芬霍金是繼愛因斯坦之後，最出色的理論物理學家。他可能是現今世上最傑出的科學天才，同時也是一位成就非凡的暢銷作家，試著將最難以表達的科學領域與大眾分享。不僅如此，霍金替行動不便的弱勢團體爭取權利，更為社會及政治議題發聲。本書將帶你一同展開一場霍金生平、理論與影響的旅程，與霍金一起試著找出我們從何而來又為何在此的謎底。三個篇章，三種角度認識霍金【霍金的人生】童年時光／那一年霍金一家展開從英國到印度的公路之旅逐漸逼近的風暴／說出的話開始有些模糊，綁鞋帶變得有點困難墜入愛河／那股支持霍金前進的力量霍金怎麼做研究／一條橫跨40頁的公式霍金的孩子們 ... En savoir plus

$21.99 CAD ou Gratuit avec Kobo Plus

「我的志向很單純。徹底了解我們的宇宙，為什麼它是現在這個模樣？為什麼它會存在？」──史蒂芬‧霍金你是否買了一本《時間簡史》，但總是撐不過第二頁？你是否覺得「黑洞」是個很迷人，卻又太神祕的字詞？你是否也對這位家喻戶曉、擁有電腦合成嗓音的天才充滿好奇？史蒂芬霍金是繼愛因斯坦之後，最出色的理論物理學家。他可能是現今世上最傑出的科學天才，同時也是一位成就非凡的暢銷作家，試著將最難以表達的科學領域與大眾分享。不僅如此，霍金替行動不便的弱勢團體爭取權利，更為社會及政治議題發聲。本書將帶你一同展開一場霍金生平、理論與影響的旅程，與霍金一起試著找出我們從何而來又為何在此的謎底。三個篇章，三種角度認識霍金【霍金的人生】童年時光／那一年霍金一家展開從英國到印度的公路之旅逐漸逼近的風暴／說出的話開始有些模糊，綁鞋帶變得有點困難墜入愛河／那股支持霍金前進的力量霍金怎麼做研究／一條橫跨40頁的公式霍金的孩子們
... En savoir plus

Liseuses

Applis

Accessoires

Panier

Vous profitez des avantages réservés aux VIP !

Votre panier est vide

Disponible:

1 livre audio par mois

+ Essai GRATUIT de 30 jours

Disponible:

1 livre audio par mois

+ Essai GRATUIT de 30 jours

Recommandé pour vous

Livres audio Physique relativiste

Afficher :