🏁 Digital Arms Race

The escalating competition between nations and actors wielding cyber weapons, where code becomes as strategically significant as any conventional arsenal.

Four Battlegrounds

by Paul Scharre • 2023

AI is a contest for physical and intellectual resources; the winner writes the rules of the century.

3.83

522

🏛️ Ai Policy ⚔️ Military Ai 📡 Digital Repression

Four Battlegrounds 91%

AI is a contest for physical and intellectual resources; the winner writes the rules of the century.

by Paul Scharre 2023

3.83

522 ratings

🏛️ Ai Policy ⚔️ Military Ai 📡 Digital Repression

Cybersecurity and Cyberwar

by P.W. Singer • 2013

The Internet trusts everyone. That made it a battlefield where attackers rarely get caught.

3.83

1k+

🔐 Information Security ⚔️ Cyber Warfare 🕵️ State-Sponsored Hacking

Cybersecurity and Cyberwar 90%

The Internet trusts everyone. That made it a battlefield where attackers rarely get caught.

by P.W. Singer 2013

3.83

1k+ ratings

🔐 Information Security ⚔️ Cyber Warfare 🕵️ State-Sponsored Hacking

The Hacker and the State

by Ben Buchanan • 2020

The most damaging attacks of this century arrived not through the air, but through code.

4.19

871

💻 Cyber Warfare 🕵️ Cyber Espionage 📡 Signals Intelligence

The Hacker and the State 90%

The most damaging attacks of this century arrived not through the air, but through code.

by Ben Buchanan 2020

4.19

871 ratings

💻 Cyber Warfare 🕵️ Cyber Espionage 📡 Signals Intelligence

T-Minus AI

by Michael Kanaan • 2020

AI will decide global power. The race has already started, and not everyone plays fair.

3.74

721

🌐 Ai Geopolitics 🏁 Tech Arms Races 🇺🇸 Us China Rivalry

T-Minus AI 90%

AI will decide global power. The race has already started, and not everyone plays fair.

by Michael Kanaan 2020

3.74

721 ratings

🌐 Ai Geopolitics 🏁 Tech Arms Races 🇺🇸 Us China Rivalry

The Great Tech Game

by Anirudh Suri • 2022

Power once meant factories and oil. Now it runs on code, chips, and data.

4.43

131

🖥️ Tech Geopolitics 💻 Digital Economy 🌐 Great Power Competition

The Great Tech Game 90%

Power once meant factories and oil. Now it runs on code, chips, and data.

by Anirudh Suri 2022

4.43

131 ratings

🖥️ Tech Geopolitics 💻 Digital Economy 🌐 Great Power Competition

This Is How They Tell Me the World Ends

by Nicole Perlroth • 2021

Inside the hidden bazaar where governments and criminals buy the keys to your digital life.

4.31

11k+

🧨 Zero-Day Exploits 💣 Cyberwarfare 👁️ Surveillance State

This Is How They Tell Me the World Ends Summary

This Is How They Tell Me the World Ends 90%

Inside the hidden bazaar where governments and criminals buy the keys to your digital life.

by Nicole Perlroth 2021

4.31

11k+ ratings

🧨 Zero-Day Exploits 💣 Cyberwarfare 👁️ Surveillance State

The New Digital Age

by Eric Schmidt • 2013

Five billion new internet users will change war, privacy, and revolution forever.

3.33

3k+

🌐 Internet Geopolitics 🔮 Digital Futures ⚔️ Cyber Conflict

The New Digital Age 90%

Five billion new internet users will change war, privacy, and revolution forever.

by Eric Schmidt 2013

3.33

3k+ ratings

🌐 Internet Geopolitics 🔮 Digital Futures ⚔️ Cyber Conflict

The Technological Republic

by Alexander C. Karp • 2025

The West won the digital revolution, then stopped building weapons. Now software is the battlefield.

3.54

4k+

🛡️ Defense Technology 💻 Tech Industry Critique 🏛️ State-Tech Partnership

The Technological Republic 90%

The West won the digital revolution, then stopped building weapons. Now software is the battlefield.

by Alexander C. Karp 2025

3.54

4k+ ratings

🛡️ Defense Technology 💻 Tech Industry Critique 🏛️ State-Tech Partnership

The Origins of Victory

by Andrew F. Krepinevich • 2023

Precision warfare gave America dominance. That revolution is over. The next one has already begun.

4.12

315

🔧 Military Innovation 🌍 Great Power Rivalry 💡 Disruptive Innovation

The Origins of Victory 90%

Precision warfare gave America dominance. That revolution is over. The next one has already begun.

by Andrew F. Krepinevich 2023

4.12

315 ratings

🔧 Military Innovation 🌍 Great Power Rivalry 💡 Disruptive Innovation

Inside Cyber Warfare

by Jeffrey Carr • 2009

Cyberwar is a proxy war: states pull the strings, criminals and patriots pull the triggers.

3.36

216

🖥️ Cyber Warfare 🕶️ Proxy Warfare 💰 Cyber Crime Nexus

Inside Cyber Warfare 89%

Cyberwar is a proxy war: states pull the strings, criminals and patriots pull the triggers.

by Jeffrey Carr 2009

3.36

216 ratings

🖥️ Cyber Warfare 🕶️ Proxy Warfare 💰 Cyber Crime Nexus

Dark Territory

by Fred Kaplan • 2016

Reagan asked if 'WarGames' was real. The answer launched a covert digital war still raging today.

3.90

3k+

🖥️ Cyber Warfare 🕵️ Digital Espionage 🏛️ Cybersecurity Policy

Dark Territory 89%

Reagan asked if 'WarGames' was real. The answer launched a covert digital war still raging today.

by Fred Kaplan 2016

3.90

3k+ ratings

🖥️ Cyber Warfare 🕵️ Digital Espionage 🏛️ Cybersecurity Policy

Battlefield Cyber

by William J. Holstein • 2023

America is being hollowed out in a cyber war that stops just short of bombs.

4.01

🛡️ Cyber Warfare 🇺🇸 National Security 🌫️ Gray Zone Conflict

Battlefield Cyber 89%

America is being hollowed out in a cyber war that stops just short of bombs.

by William J. Holstein 2023

4.01

94 ratings

🛡️ Cyber Warfare 🇺🇸 National Security 🌫️ Gray Zone Conflict

The Fifth Domain

by Richard A. Clarke • 2019

A new battlefield has emerged online. Defense is up to companies and individuals not just government

4.02

825

🔒 Cybersecurity ⚔️ Cyber Warfare 📊 Cyber Risk Management

The Fifth Domain 89%

A new battlefield has emerged online. Defense is up to companies and individuals not just government

by Richard A. Clarke 2019

4.02

825 ratings

🔒 Cybersecurity ⚔️ Cyber Warfare 📊 Cyber Risk Management

Cryptography

by Keith M. Martin • 2020

Your digital life depends on secret math. Who should be able to break it?

3.96

174

🔒 Digital Security 🔐 Encryption 👁️ Digital Privacy

Cryptography 89%

Your digital life depends on secret math. Who should be able to break it?

by Keith M. Martin 2020

3.96

174 ratings

🔒 Digital Security 🔐 Encryption 👁️ Digital Privacy

Dragnet Nation

by Julia Angwin • 2014

A journalist tried to opt out of digital surveillance for a year. The system refused.

3.68

659

🛡️ Digital Surveillance 🔒 Data Privacy 👁️ Mass Surveillance

Dragnet Nation 89%

A journalist tried to opt out of digital surveillance for a year. The system refused.

by Julia Angwin 2014

3.68

659 ratings

🛡️ Digital Surveillance 🔒 Data Privacy 👁️ Mass Surveillance

The Coming Wave

by Mustafa Suleyman • 2023

AI and biotech are coming. They can't be stopped. They can't be contained. Catastrophe or dystopia?

3.80

15k+

🏛️ Tech Policy ⚠️ Existential Risk 🤖 Ai Safety

The Coming Wave 89%

AI and biotech are coming. They can't be stopped. They can't be contained. Catastrophe or dystopia?

by Mustafa Suleyman 2023

3.80

15k+ ratings

🏛️ Tech Policy ⚠️ Existential Risk 🤖 Ai Safety

The Art of Invisibility

by Kevin D. Mitnick • 2017

From encrypted messages to burner devices, a hacker guide to vanishing from always-on surveillance.

3.98

5k+

🛡️ Digital Privacy 🔒 Operational Security 👁️ Mass Surveillance

The Art of Invisibility 89%

From encrypted messages to burner devices, a hacker guide to vanishing from always-on surveillance.

by Kevin D. Mitnick 2017

3.98

5k+ ratings

🛡️ Digital Privacy 🔒 Operational Security 👁️ Mass Surveillance

Artificial Intelligence and the Future of Power

by Rajiv Malhotra • 2021

Two nations race to own AI. The prize: your job, your mind, and the global pecking order.

4.28

217

🌍 Ai Geopolitics 🛡️ Digital Sovereignty 🏭 Job Displacement

Artificial Intelligence and the Future of Power Summary

Artificial Intelligence and the Future of Power 89%

Two nations race to own AI. The prize: your job, your mind, and the global pecking order.

by Rajiv Malhotra 2021

4.28

217 ratings

🌍 Ai Geopolitics 🛡️ Digital Sovereignty 🏭 Job Displacement

The Future of Violence

by Benjamin Wittes • 2014

The state's monopoly on violence is ending. Networked technology handed individuals strategic power.

3.42

318

🔒 Cybersecurity 🛡️ National Security 💻 Technology Policy

The Future of Violence 89%

The state's monopoly on violence is ending. Networked technology handed individuals strategic power.

by Benjamin Wittes 2014

3.42

318 ratings

🔒 Cybersecurity 🛡️ National Security 💻 Technology Policy

If Anyone Builds It, Everyone Dies

by Eliezer Yudkowsky • 2025

Superhuman AI kills without malice. Its goals turn our atoms into raw material, not our future.

3.92

7k+

🛡️ Ai Safety ⚠️ Existential Risk 🏁 Technology Arms Races

If Anyone Builds It, Everyone Dies Summary

If Anyone Builds It, Everyone Dies 89%

Superhuman AI kills without malice. Its goals turn our atoms into raw material, not our future.

by Eliezer Yudkowsky 2025

3.92

7k+ ratings

🛡️ Ai Safety ⚠️ Existential Risk 🏁 Technology Arms Races

Our Final Invention

by James Barrat • 2013

An intelligence greater than human will not hate us; it simply won't need us.

3.72

4k+

🤖 Ai Safety ⚠️ Existential Risk 🧠 Superintelligence

Our Final Invention 89%

An intelligence greater than human will not hate us; it simply won't need us.

by James Barrat 2013

3.72

4k+ ratings

🤖 Ai Safety ⚠️ Existential Risk 🧠 Superintelligence

Sandworm

by Andy Greenberg • 2019

First hacker-caused blackouts, then a $10 billion attack. Both traced to a single Russian unit.

4.34

10k+

💻 Cyberwar 🕵️ State-Sponsored Hacking 🏭 Critical Infrastructure

Sandworm 88%

First hacker-caused blackouts, then a $10 billion attack. Both traced to a single Russian unit.

by Andy Greenberg 2019

4.34

10k+ ratings

💻 Cyberwar 🕵️ State-Sponsored Hacking 🏭 Critical Infrastructure

Future Crimes

by Marc Goodman • 2015

Crime went corporate. The dark web runs like Amazon, and your digital exhaust is its inventory.

3.92

4k+

🛡️ Cybersecurity 🕶️ Dark Web 💻 Digital Crime

Future Crimes 88%

Crime went corporate. The dark web runs like Amazon, and your digital exhaust is its inventory.

by Marc Goodman 2015

3.92

4k+ ratings

🛡️ Cybersecurity 🕶️ Dark Web 💻 Digital Crime

Nuclear War

by Annie Jacobsen • 2024

North Korea fires a missile. Civilization ends in 72 minutes. Exactly how, protocol by protocol.

4.36

53k+

🚀 Nuclear Deterrence 📋 Nuclear Policy 🏃 Arms Race

Nuclear War 88%

North Korea fires a missile. Civilization ends in 72 minutes. Exactly how, protocol by protocol.

by Annie Jacobsen 2024

4.36

53k+ ratings

🚀 Nuclear Deterrence 📋 Nuclear Policy 🏃 Arms Race

The Cuckoo's Egg

by Clifford Stoll • 1989

A 75-cent error, a pager, one astronomer chasing a KGB spy through military networks.

4.28

16k+

🛡️ Cybersecurity 🕵️ Cold War Espionage 🔍 Digital Forensics

The Cuckoo's Egg 88%

A 75-cent error, a pager, one astronomer chasing a KGB spy through military networks.

by Clifford Stoll 1989

4.28

16k+ ratings

🛡️ Cybersecurity 🕵️ Cold War Espionage 🔍 Digital Forensics

The Future of the Internet--And How to Stop It

by Jonathan L. Zittrain • 2008

Wikipedia and malware share one cause: an open internet. The locked-down alternative kills both.

3.86

1k+

🌐 Internet Governance ⚖️ Cyberlaw 🕸️ Decentralized Networks

The Future of the Internet--And How to Stop It Summary

The Future of the Internet--And How to Stop It 88%

Wikipedia and malware share one cause: an open internet. The locked-down alternative kills both.

by Jonathan L. Zittrain 2008

3.86

1k+ ratings

🌐 Internet Governance ⚖️ Cyberlaw 🕸️ Decentralized Networks

The Anarchist In The Library

by Siva Vaidhyanathan • 2004

The web set free-sharing anarchists against control-hungry oligarchs, and neither side is winning.

3.50

175

🛡️ Digital Rights ⚖️ Copyright Politics 🏛️ Cultural Commons

The Anarchist In The Library 88%

The web set free-sharing anarchists against control-hungry oligarchs, and neither side is winning.

by Siva Vaidhyanathan 2004

3.50

175 ratings

🛡️ Digital Rights ⚖️ Copyright Politics 🏛️ Cultural Commons

The Red Web

by Andrei Soldatov • 2015

The Soviet Union fell but its surveillance state survived, rewired for the internet age.

3.95

700

🏛️ Digital Authoritarianism 🇷🇺 Putin'S Russia 👁️ Surveillance State

The Red Web 88%

The Soviet Union fell but its surveillance state survived, rewired for the internet age.

by Andrei Soldatov 2015

3.95

700 ratings

🏛️ Digital Authoritarianism 🇷🇺 Putin'S Russia 👁️ Surveillance State

If It's Smart, It's Vulnerable

by Mikko Hypponen • 2021

Every connected device is a target. A cybersecurity veteran maps the attack surface of modern life.

4.10

2k+

🔒 Cybersecurity 🌐 Internet History 🔍 Digital Privacy

If It's Smart, It's Vulnerable 88%

Every connected device is a target. A cybersecurity veteran maps the attack surface of modern life.

by Mikko Hypponen 2021

4.10

2k+ ratings

🔒 Cybersecurity 🌐 Internet History 🔍 Digital Privacy

Tools and Weapons

by Brad Smith • 2019

Tech weaponized your data, your vote, your face. An insider's plan to take them back.

3.85

2k+

🏛️ Tech Policy 🔒 Privacy Rights 🛡️ Cybersecurity

Tools and Weapons 88%

Tech weaponized your data, your vote, your face. An insider's plan to take them back.

by Brad Smith 2019

3.85

2k+ ratings

🏛️ Tech Policy 🔒 Privacy Rights 🛡️ Cybersecurity

Privacy in the Age of Big Data

by Theresa Payton • 2014

Your devices watch everything you do. Here is what they collect and how to stop it.

3.56

112

🔒 Digital Privacy 👁️ Data Surveillance 📊 Personal Data

Privacy in the Age of Big Data 88%

Your devices watch everything you do. Here is what they collect and how to stop it.

by Theresa Payton 2014

3.56

112 ratings

🔒 Digital Privacy 👁️ Data Surveillance 📊 Personal Data

The Future of Geography

by Tim Marshall • 2023

Space is the new geography of power: every conflict below is replicating in orbit.

3.91

8k+

🚀 New Space Race 🛰️ Astropolitics 💥 Space Warfare

The Future of Geography 88%

Space is the new geography of power: every conflict below is replicating in orbit.

by Tim Marshall 2023

3.91

8k+ ratings

🚀 New Space Race 🛰️ Astropolitics 💥 Space Warfare

The Inevitable

by Kevin Kelly • 2016

Twelve forces are bending civilization in one direction, and we have just left the gate.

3.89

12k+

🔄 Digital Economy 🔮 Technological Forecasting 📊 Information Economy

The Inevitable 88%

Twelve forces are bending civilization in one direction, and we have just left the gate.

by Kevin Kelly 2016

3.89

12k+ ratings

🔄 Digital Economy 🔮 Technological Forecasting 📊 Information Economy

The Imagineers of War

by Sharon Weinberger • 2017

DARPA gave us the Internet and lost Vietnam. The same faith in technology drove both.

3.69

565

🛰️ Cold War Science 🔬 Defense Research 🏛️ Institutional History

The Imagineers of War 88%

DARPA gave us the Internet and lost Vietnam. The same faith in technology drove both.

by Sharon Weinberger 2017

3.69

565 ratings

🛰️ Cold War Science 🔬 Defense Research 🏛️ Institutional History

Digital Empires

by Anu Bradford • 2023

Three powers are battling to govern the internet, and the prize is the future of democracy.

3.91

151

🌐 Internet Governance ⚖️ Regulatory Competition 🇨🇳 Techno-Nationalism

Digital Empires 88%

Three powers are battling to govern the internet, and the prize is the future of democracy.

by Anu Bradford 2023

3.91

151 ratings

🌐 Internet Governance ⚖️ Regulatory Competition 🇨🇳 Techno-Nationalism

Cult of the Dead Cow

by Joseph Menn • 2019

From BBS pranks to Pentagon briefings: how a hacker collective wrote the playbook for cyberdefense.

3.75

2k+

💻 Hacker Culture ✊ Hacktivism 🛡️ Ethical Hacking

Cult of the Dead Cow 88%

From BBS pranks to Pentagon briefings: how a hacker collective wrote the playbook for cyberdefense.

by Joseph Menn 2019

3.75

2k+ ratings

💻 Hacker Culture ✊ Hacktivism 🛡️ Ethical Hacking

The Exponential Age

by Azeem Azhar • 2021

Tech accelerates exponentially; institutions crawl. The gap is reshaping wealth, work, and war.

3.98

1k+

🤖 Technology And Society ⚡ Digital Disruption 🐌 Institutional Lag

The Exponential Age 88%

Tech accelerates exponentially; institutions crawl. The gap is reshaping wealth, work, and war.

by Azeem Azhar 2021

3.98

1k+ ratings

🤖 Technology And Society ⚡ Digital Disruption 🐌 Institutional Lag

The People Vs Tech

by Jamie Bartlett • 2018

Liberal democracy rests on a few fragile pillars; the internet is dismantling every one.

3.90

2k+

🗳️ Digital Politics 🏛️ Tech Monopolies 🎭 Political Tribalism

The People Vs Tech 88%

Liberal democracy rests on a few fragile pillars; the internet is dismantling every one.

by Jamie Bartlett 2018

3.90

2k+ ratings

🗳️ Digital Politics 🏛️ Tech Monopolies 🎭 Political Tribalism

The Palestine Laboratory

by Antony Loewenstein • 2023

Palestine is a live testing ground. The weapons perfected there now police the world.

4.43

3k+

🏭 Defense Industry 📡 Surveillance State 🧱 Border Militarization

The Palestine Laboratory 88%

Palestine is a live testing ground. The weapons perfected there now police the world.

by Antony Loewenstein 2023

4.43

3k+ ratings

🏭 Defense Industry 📡 Surveillance State 🧱 Border Militarization

Rewiring Democracy

by Bruce Schneier • 2025

AI writes laws, targets voters, judges cases. Democracy is an information system; AI is the driver.

3.67

🖥️ Digital Governance ⚖️ Algorithmic Bias 🏛️ Power Concentration

Rewiring Democracy 88%

AI writes laws, targets voters, judges cases. Democracy is an information system; AI is the driver.

by Bruce Schneier 2025

3.67

91 ratings

🖥️ Digital Governance ⚖️ Algorithmic Bias 🏛️ Power Concentration

Superintelligence

by Nick Bostrom • 2014

A superhuman intelligence won't hate us. It will just want our atoms.

3.85

21k+

🛡️ Ai Safety ⚠️ Existential Risk 🌍 Effective Altruism

Superintelligence 88%

A superhuman intelligence won't hate us. It will just want our atoms.

by Nick Bostrom 2014

3.85

21k+ ratings

🛡️ Ai Safety ⚠️ Existential Risk 🌍 Effective Altruism

Program or Be Programmed

by Douglas Rushkoff • 2010

Digital tools have biases. If you can't read their code, someone else writes your behavior.

3.72

2k+

🌐 Media Ecology ⚖️ Technological Bias 🎮 Digital Agency

Program or Be Programmed 88%

Digital tools have biases. If you can't read their code, someone else writes your behavior.

by Douglas Rushkoff 2010

3.72

2k+ ratings

🌐 Media Ecology ⚖️ Technological Bias 🎮 Digital Agency

Digital Transformation

by Thomas M. Siebel • 2019

Corporate lifespans dropped from 60 years to 20. Four technologies determine who goes extinct.

3.87

766

🏭 Digital Disruption 🔄 Organizational Change 👔 CEO Leadership

Digital Transformation 88%

Corporate lifespans dropped from 60 years to 20. Four technologies determine who goes extinct.

by Thomas M. Siebel 2019

3.87

766 ratings

🏭 Digital Disruption 🔄 Organizational Change 👔 CEO Leadership

You Are Not a Gadget

by Jaron Lanier • 2010

The internet reduces people to data points. The people who built it call that wisdom.

3.57

6k+

🖥️ Digital Criticism 🧑‍💻 Tech Humanism 🤔 Technoskepticism

You Are Not a Gadget 88%

The internet reduces people to data points. The people who built it call that wisdom.

by Jaron Lanier 2010

3.57

6k+ ratings

🖥️ Digital Criticism 🧑‍💻 Tech Humanism 🤔 Technoskepticism

Age of Danger

by Andrew R. Hoehn • 2023

Built for 1947, retooled for terrorism: America's defense system is blind to the threats now coming.

3.81

🛡️ Us Defense Policy 🌍 Great Power Competition 🐢 Bureaucratic Inertia

Age of Danger 88%

Built for 1947, retooled for terrorism: America's defense system is blind to the threats now coming.

by Andrew R. Hoehn 2023

3.81

70 ratings

🛡️ Us Defense Policy 🌍 Great Power Competition 🐢 Bureaucratic Inertia

"I Have Nothing to Hide"

by Heidi Boghosian • 2021

Mass surveillance survives on one belief: privacy is for wrongdoers. Twenty myths keep it expanding.

3.64

191

🛰️ Mass Surveillance 🔒 Digital Privacy 🏢 Corporate Surveillance

"I Have Nothing to Hide" 88%

Mass surveillance survives on one belief: privacy is for wrongdoers. Twenty myths keep it expanding.

by Heidi Boghosian 2021

3.64

191 ratings

🛰️ Mass Surveillance 🔒 Digital Privacy 🏢 Corporate Surveillance

Context

by Cory Doctorow • 2011

3.66

372

🕸️ Internet Freedom 📜 Copyright Reform 🔐 Digital Rights

Context 88%

by Cory Doctorow 2011

3.66

372 ratings

🕸️ Internet Freedom 📜 Copyright Reform 🔐 Digital Rights

The Hacker Crackdown

by Bruce Sterling • 1992

One AT&T crash, one Secret Service raid, and the accidental birth of digital civil liberties

3.80

3k+

💻 Hacker Culture 🌐 Digital Subcultures ☎️ Telephone History

The Hacker Crackdown 88%

One AT&T crash, one Secret Service raid, and the accidental birth of digital civil liberties

by Bruce Sterling 1992

3.80

3k+ ratings

💻 Hacker Culture 🌐 Digital Subcultures ☎️ Telephone History

Everyday Chaos

by David Weinberger • 2019

A medical AI diagnoses illness but can't explain how. The age of demanding explanations is over.

3.78

202

🔬 Complexity Science 🔄 Systems Thinking 🤖 Machine Learning

Everyday Chaos 88%

A medical AI diagnoses illness but can't explain how. The age of demanding explanations is over.

by David Weinberger 2019

3.78

202 ratings

🔬 Complexity Science 🔄 Systems Thinking 🤖 Machine Learning

Chip War

by Chris Miller100 • 2022

One island makes nearly every advanced computer chip. Everything else is up for grabs.

4.40

43k+

💻 Computing History 🌐 Geopolitics Of Tech 🔗 Global Supply Chains

Chip War 88%

One island makes nearly every advanced computer chip. Everything else is up for grabs.

by Chris Miller100 2022

4.40

43k+ ratings

💻 Computing History 🌐 Geopolitics Of Tech 🔗 Global Supply Chains

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