All Seasons

Season 2012

• S2012E01 Why do we have tattoos?

  • September 14, 2012

• S2012E02 Why do we wear ties?

  • September 24, 2012

• S2012E03 Why do we Behave so Oddly Inside Elevators?

  • September 28, 2012

• S2012E04 Why do we smoke?

  • October 5, 2012

• S2012E05 The Bullet

  • October 12, 2012

• S2012E06 Why do we laugh?

  • October 19, 2012

• S2012E07 The Shaved Head

  • October 26, 2012

• S2012E08 The Handshake

  • November 2, 2012

• S2012E09 Coming of Age

  • November 9, 2012

• S2012E10 Blue

  • November 16, 2012

• S2012E11 The Tap

  • November 23, 2012

• S2012E12 Fear - Episode 1

  • November 30, 2012

• S2012E13 Fear - Episode 2

  • December 7, 2012

• S2012E14 The Drum

  • December 14, 2012

• S2012E15 The Sackman (and other stories)

  • December 21, 2012

• S2012E16 Manners

  • December 28, 2012

Season 2013

• S2013E01 Nitrogen: Forgetting Fritz

  • January 4, 2013

• S2013E02 The Heel

  • January 11, 2013

• S2013E03 The Boxers of Bukom

  • January 18, 2013

• S2013E04 Mirrors

  • January 26, 2013

• S2013E05 The Mob

  • February 2, 2013

• S2013E06 Black

  • February 8, 2013

• S2013E07 Why are Open Plan Offices the Norm?

  • February 15, 2013

• S2013E08 Cultural Memory

  • February 22, 2013

• S2013E09 PTSD

  • March 2, 2013

• S2013E10 Silence

  • March 8, 2013

• S2013E11 Sleep

  • March 15, 2013

• S2013E12 Why do we get insomnia?

  • March 22, 2013

• S2013E13 Retirement

  • March 30, 2013

• S2013E14 Ageing

  • April 5, 2013

• S2013E15 The Kiss

  • April 12, 2013

• S2013E16 Singing

  • April 19, 2013

• S2013E17 Gold

  • April 26, 2013

• S2013E18 Pets

  • May 3, 2013

• S2013E19 Disgust

  • May 10, 2013

• S2013E20 The Lie

  • May 17, 2013

• S2013E21 The Ball

  • May 24, 2013

• S2013E22 Make-up

  • May 31, 2013

• S2013E23 The Sea

  • June 7, 2013

• S2013E24 Bathing: Supernatural Waters

  • June 14, 2013

• S2013E25 Bathing: Water, Health and Well-being

  • June 21, 2013

• S2013E26 The City

  • July 5, 2013

• S2013E27 Fire

  • July 12, 2013

• S2013E28 Tattoos

  • July 19, 2013

• S2013E29 Ageing

  • July 26, 2013

• S2013E30 Violent Entertainment

  • August 2, 2013

• S2013E31 Mountains

  • August 9, 2013

• S2013E32 Celebrity

  • August 16, 2013

• S2013E33 Monogamy

  • August 23, 2013

• S2013E34 Female Body Hair

  • August 30, 2013

• S2013E35 Memory

  • September 6, 2013

• S2013E36 Fasting

  • September 13, 2013

• S2013E37 Sad Music

  • September 20, 2013

• S2013E38 Nostalgia

  • September 27, 2013

• S2013E39 Burial

  • October 4, 2013

• S2013E40 Swearing

  • October 11, 2013

• S2013E41 Bullying

  • October 18, 2013

• S2013E42 Speed

  • October 25, 2013

• S2013E43 The Lie

  • November 2, 2013

• S2013E44 Optimism and Pessimism

  • November 8, 2013

• S2013E45 Secrets

  • November 15, 2013

• S2013E46 Solitude

  • November 22, 2013

• S2013E47 The Heel

  • November 29, 2013

• S2013E48 Crying

  • December 6, 2013

• S2013E49 Cross Dressing

  • December 13, 2013

• S2013E50 Debt

  • December 20, 2013

• S2013E51 Nitrogen: Forgetting Fritz

  • December 27, 2013

Season 2014

• S2014E01 Running

  • January 3, 2014

• S2014E02 Alcohol

  • January 10, 2014

• S2014E03 Masks

  • January 17, 2014

• S2014E04 Homosexuality

  • January 24, 2014

• S2014E05 Touch

  • January 31, 2014

• S2014E06 Adolescence

  • February 7, 2014

• S2014E07 Trees of Life

  • February 14, 2014

• S2014E08 Coffee

  • February 21, 2014

• S2014E09 Privacy

  • February 28, 2014

• S2014E10 Given Names

  • March 7, 2014

• S2014E11 Family Names

  • March 14, 2014

• S2014E12 Dance

  • March 21, 2014

• S2014E13 Envy

  • March 28, 2014

• S2014E14 Boredom

  • April 4, 2014

• S2014E15 Racism

  • April 11, 2014

• S2014E16 Horoscopes

  • April 18, 2014

• S2014E17 Luck

  • April 25, 2014

• S2014E18 The Kiss

  • May 2, 2014

• S2014E19 Sticky Songs

  • May 9, 2014

• S2014E20 Symmetry

  • May 16, 2014

• S2014E21 Competition

  • May 23, 2014

• S2014E22 Diplomacy

  • May 30, 2014

• S2014E23 The Fool

  • June 6, 2014

• S2014E24 Why Eye Contact is Important

  • June 13, 2014

• S2014E25 Accents

  • June 20, 2014

• S2014E26 World War One: Patriotism

  • June 27, 2014

• S2014E27 Coincidence

  • July 4, 2014

• S2014E28 The Apology

  • July 11, 2014

• S2014E29 The Moon

  • July 18, 2014

• S2014E30 The Walk

  • July 25, 2014

• S2014E31 The Pilgrimage

  • August 1, 2014

• S2014E32 Chastity

  • August 8, 2014

• S2014E33 Ghosts

  • August 15, 2014

• S2014E34 Gossip

  • August 22, 2014

• S2014E35 Gardens

  • August 29, 2014

• S2014E36 The 100th Programme: The Life of Why

  • September 5, 2014

• S2014E37 Protest

  • September 12, 2014

• S2014E38 Risking Life For Strangers

  • September 19, 2014

• S2014E39 The Rivals

  • September 26, 2014

• S2014E40 What is Charisma?

  • October 3, 2014

• S2014E41 Brands

  • October 10, 2014

• S2014E42 Karma

  • October 17, 2014

• S2014E43 Embarrassment

  • October 24, 2014

• S2014E44 Chess

  • October 31, 2014

• S2014E45 Memorialisation

  • November 7, 2014

• S2014E46 Poetry

  • November 15, 2014

• S2014E47 Letters

  • November 22, 2014

• S2014E48 Cookery

  • November 29, 2014

• S2014E49 Nudity

  • December 6, 2014

• S2014E50 Sharing

  • December 13, 2014

• S2014E51 Perfume

  • December 20, 2014

• S2014E52 Honour

  • December 27, 2014

Season 2015

• S2015E01 The Moon

  • January 3, 2015

• S2015E02 Portrait Photography

  • January 10, 2015

• S2015E03 Loyalty

  • January 17, 2015

• S2015E04 Why Do We Fly Flags?

  • January 24, 2015

• S2015E05 Sad Music

  • January 31, 2015

• S2015E06 Why are watches enduring status symbols?

  • February 7, 2015

• S2015E07 Rejecting Riches

  • February 14, 2015

• S2015E08 Chasing Riches

  • February 21, 2015

• S2015E09 Skyscrapers

  • February 28, 2015

• S2015E10 Crime Fiction

  • March 7, 2015

• S2015E11 Forgetting

  • March 14, 2015

• S2015E12 Death Penalty

  • March 21, 2015

• S2015E13 The Refugee Journey

  • March 28, 2015

• S2015E14 Suicide

  • April 3, 2015

• S2015E15 Daydreaming

  • April 10, 2015

• S2015E16 The Circus

  • April 17, 2015

• S2015E17 Animals Are Us?

  • April 24, 2015

• S2015E18 Jargon

  • May 1, 2015

• S2015E19 Collecting

  • May 8, 2015

• S2015E20 Television

  • May 15, 2015

• S2015E21 The Y Chromosome

  • May 22, 2015

• S2015E22 Blue Jeans

  • May 29, 2015

• S2015E23 The Evolution of Beards

  • June 5, 2015

• S2015E24 Why do we Draw?

  • June 12, 2015

• S2015E25 How Chillies Became Hot

  • June 19, 2015

• S2015E26 Why do People Take Risks?

  • June 26, 2015

• S2015E27 Why Do We Need Cash?

  • July 3, 2015

• S2015E28 Nationality

  • July 10, 2015

• S2015E29 Why do Top Sportsmen and Women Choke?

  • July 17, 2015

• S2015E30 Encryption

  • July 24, 2015

• S2015E31 What is a Home?

  • July 31, 2015

• S2015E32 Why do we travel?

  • August 7, 2015

• S2015E33 Why Do We Need Diaries?

  • August 14, 2015

• S2015E34 Talking about Death

  • August 21, 2015

• S2015E35 Why do people sacrifice their lives?

  • August 28, 2015

• S2015E36 World War One: Sacrifice

  • August 29, 2015

• S2015E37 Why do we have Human Rights?

  • September 4, 2015

• S2015E38 Why do Humans Need so Much Space?

  • September 11, 2015

• S2015E39 Why Does the World Love Drinking Tea?

  • September 18, 2015

• S2015E40 Why Do We Love Dolls?

  • September 25, 2015

• S2015E41 Graffiti: Why do we do it?

  • October 2, 2015

• S2015E42 Why Does Commuting Make us the Way we Are?

  • October 9, 2015

• S2015E43 Why Do we Support Sports Clubs?

  • October 16, 2015

• S2015E44 Why Does Everyone Wear Trainers?

  • October 23, 2015

• S2015E45 Why Do We Love the Bicycle?

  • October 30, 2015

• S2015E46 Why Can’t Some People Eat Certain Foods?

  • November 6, 2015

• S2015E47 Tutoring

  • November 13, 2015

• S2015E48 What Makes us Want to Wear T-Shirts?

  • November 20, 2015

• S2015E49 Why do we wear Suits?

  • November 27, 2015

• S2015E50 Why Do We Wear Ties?

  • December 4, 2015

• S2015E51 Why Do We Wear Skirts?

  • December 11, 2015

• S2015E52 Why Do We Make Lists?

  • December 18, 2015

• S2015E53 Group Thinking

  • December 25, 2015

Season 2016

• S2016E01 Hunting

  • January 1, 2016

• S2016E02 Hypocrisy: Why do People Often say One Thing and do Another?

  • January 8, 2016

• S2016E03 Why Do we Want or Need Heroes?

  • January 15, 2016

• S2016E04 Age of Consent

  • January 22, 2016

• S2016E05 Impersonators: Why do People Pretend to be Someone Else?

  • January 29, 2016

• S2016E06 Why is Water Exceptional?

  • February 5, 2016

• S2016E07 Pleasure: Why We Like the Things We Like

  • February 12, 2016

• S2016E08 Addiction: Why Do Some People Succumb to it?

  • February 19, 2016

• S2016E09 Why We Search for the Origins of Life

  • February 26, 2016

• S2016E10 Conspiracy Theory

  • March 4, 2016

• S2016E11 Magicians: Inside their Minds

  • March 11, 2016

• S2016E12 Supernatural Powers

  • March 18, 2016

• S2016E13 Fanfiction

  • March 25, 2016

• S2016E14 Identity

  • April 1, 2016

• S2016E15 Why I’m Not Just Blind

  • April 8, 2016

• S2016E16 Radio Requests

  • April 15, 2016

• S2016E17 How America Sees Itself

  • April 22, 2016

• S2016E18 Dolly, Dylan or Daft Punk

  • April 23, 2016

• S2016E19 How the Rest of the World Sees America

  • April 29, 2016

• S2016E20 Life, Liberty and the American Identity

  • April 30, 2016

• S2016E21 Statues: Why we put people on pedestals

  • May 6, 2016

• S2016E22 Time Perception

  • May 13, 2016

• S2016E23 Why Are We Afraid of Robots?

  • May 20, 2016

• S2016E24 Thin

  • May 27, 2016

• S2016E25 Copying Art

  • June 3, 2016

• S2016E26 Safe Space

  • June 13, 2016

• S2016E27 Loneliness

  • June 17, 2016

• S2016E28 Attraction

  • June 27, 2016

• S2016E29 Newspapers

  • July 8, 2016

• S2016E30 Why Are We Getting Smarter

  • July 15, 2016

• S2016E31 Violence

  • July 22, 2016

• S2016E32 Driving

  • July 29, 2016

• S2016E33 Fear vs Fact

  • August 5, 2016

• S2016E34 Fear of Animals

  • August 12, 2016

• S2016E35 Why do pet videos go viral?

  • August 19, 2016

• S2016E36 Why not celebrate introvert personalities?

  • August 26, 2016

• S2016E37 The Voice

  • September 2, 2016

• S2016E38 Why do we find some voices irritating?

  • September 11, 2016

• S2016E39 Comic Book Superheroes

  • September 23, 2016

• S2016E40 Why do Crazes Take Off?

  • September 26, 2016

• S2016E41 Assisted Death

  • September 30, 2016

• S2016E42 Grief

  • October 7, 2016

• S2016E43 Farewell Letters

  • October 14, 2016

• S2016E44 Organ Donation

  • October 21, 2016

• S2016E45 Eye Witness Identification

  • October 28, 2016

• S2016E46 Unconscious Bias

  • November 4, 2016

• S2016E47 Hoarding

  • November 11, 2016

• S2016E48 The Family Tree

  • November 18, 2016

• S2016E49 Why Do Cities Make Us Rude?

  • November 25, 2016

• S2016E50 The Female Orgasm

  • December 5, 2016

• S2016E51 Revenge

  • December 9, 2016

• S2016E52 Why do we Get Road Rage?

  • December 16, 2016

• S2016E53 Forgiveness

  • December 23, 2016

• S2016E54 Why Do We Make Lists?

  • December 29, 2016

• S2016E55 Vigilantes

  • December 30, 2016

Season 2017

• S2017E01 Carrying Guns

  • January 7, 2017

• S2017E02 Regret

  • January 13, 2017

• S2017E03 Cryonics

  • January 27, 2017

• S2017E04 Torture

  • February 3, 2017

• S2017E05 Hypochondria

  • February 10, 2017

• S2017E06 Smiling

  • February 17, 2017

• S2017E07 Stammering

  • February 24, 2017

• S2017E08 Listening

  • March 3, 2017

• S2017E09 Hands

  • March 10, 2017

• S2017E10 Yoga

  • March 24, 2017

• S2017E11 Why do Men Want Six Packs?

  • March 27, 2017

• S2017E12 Clapping

  • April 3, 2017

• S2017E13 Underground

  • April 10, 2017

• S2017E14 Why Words Matter

  • April 17, 2017

• S2017E15 Short

  • April 24, 2017

• S2017E16 Habits

  • May 1, 2017

• S2017E17 Goths

  • May 8, 2017

• S2017E18 Are you a numbers person?

  • May 15, 2017

• S2017E19 Thankless Tasks

  • May 22, 2017

• S2017E20 Why Do We Talk To Ourselves?

  • May 29, 2017

• S2017E21 Self-Harm

  • June 5, 2017

• S2017E22 Exams

  • June 12, 2017

• S2017E23 Returning Home

  • June 19, 2017

• S2017E24 Polygamy

  • June 26, 2017

• S2017E25 The Kiss

  • July 3, 2017

• S2017E26 Childlessness

  • July 9, 2017

• S2017E27 Male Violence

  • July 24, 2017

• S2017E28 Why Do Some People Crave the Limelight?

  • July 24, 2017

• S2017E29 Sign Language

  • July 31, 2017

• S2017E30 Why Raise Other People's Children?

  • August 7, 2017

• S2017E31 Eavesdropping

  • August 14, 2017

• S2017E32 News

  • August 21, 2017

• S2017E33 Human Remains in Museums

  • August 28, 2017

• S2017E34 Complexity

  • September 4, 2017

• S2017E35 What Do You Do?

  • September 11, 2017

• S2017E36 Romance

  • September 18, 2017

• S2017E37 Surrogacy

  • September 25, 2017

• S2017E38 How to Live Small

  • October 2, 2017

• S2017E39 Staying Put

  • October 9, 2017

• S2017E40 Breath-holding

  • October 16, 2017

• S2017E41 Serial Killers

  • October 23, 2017

• S2017E42 Imposter Syndrome

  • October 30, 2017

• S2017E43 Dark Tourism

  • November 6, 2017

• S2017E44 Dubbing Movies

  • November 13, 2017

• S2017E45 Men, Women and Language

  • November 20, 2017

• S2017E46 What Can Chimps Teach us About Politics?

  • November 27, 2017

• S2017E47 Initiations

  • December 4, 2017

• S2017E48 The Crowd

  • December 11, 2017

• S2017E49 Witches

  • December 18, 2017

• S2017E50 Alcohol Addiction

  • December 25, 2017

Season 2018

• S2018E01 Sleepwalking

  • January 1, 2018

• S2018E02 Why do People Hear Voices in Their Heads?

  • January 8, 2018

• S2018E03 Noise

  • January 15, 2018

• S2018E04 Dreaming

  • January 22, 2018

• S2018E05 Vegans

  • January 29, 2018

• S2018E06 Hypnotism

  • February 5, 2018

• S2018E07 Pain

  • February 12, 2018

• S2018E08 Interviews

  • February 19, 2018

• S2018E09 Bullies

  • February 26, 2018

• S2018E10 Dinosaurs

  • March 5, 2018

• S2018E11 Why are some places still men only?

  • March 12, 2018

• S2018E12 Laziness

  • March 19, 2018

• S2018E13 Machines and Morals

  • March 26, 2018

• S2018E14 Sibling Birth Order

  • April 2, 2018

• S2018E15 Restaurant

  • April 9, 2018

• S2018E16 Fantasies

  • April 16, 2018

• S2018E17 Carrying Guns

  • April 23, 2018

• S2018E18 Giving Away Data

  • April 30, 2018

• S2018E19 Romance Fraud

  • May 7, 2018

• S2018E20 Self-Marriage

  • May 14, 2018

• S2018E21 Immortality

  • May 21, 2018

• S2018E22 Dogs

  • May 28, 2018

• S2018E23 Self-Help

  • June 4, 2018

• S2018E24 Why Do We Love Landscapes?

  • June 11, 2018

• S2018E25 Why Football is the World’s Game

  • June 18, 2018

• S2018E26 Fishing

  • June 25, 2018

• S2018E27 Status

  • July 2, 2018

• S2018E28 Us and Them

  • July 9, 2018

• S2018E29 School Reunions

  • July 16, 2018

• S2018E30 Male friendships

  • July 23, 2018

• S2018E31 Female friendships

  • July 30, 2018

• S2018E32 Why Do We Love Boats?

  • August 6, 2018

• S2018E33 Being at Sea

  • August 13, 2018

• S2018E34 Why boredom is interesting

  • August 20, 2018

• S2018E35 Antarctica

  • August 27, 2018

• S2018E36 Why do we feel heartbreak?

  • September 3, 2018

• S2018E37 Why do we forget the things we’ve learned?

  • September 10, 2018

• S2018E38 Why the father-son relationship is important

  • September 17, 2018

• S2018E39 Why has feminism affected the mother-son bond?

  • September 24, 2018

• S2018E40 Compassion Fatigue

  • October 1, 2018

• S2018E41 Rhetoric

  • October 8, 2018

• S2018E42 Why do we keep open secrets?

  • October 15, 2018

• S2018E43 Why Have Women Taken To Wellness?

  • October 22, 2018

• S2018E44 Plane, Train and Bird Spotting

  • October 29, 2018

• S2018E45 Why scarcity can damage decision making

  • November 5, 2018

• S2018E46 Fact Checkers

  • November 12, 2018

• S2018E47 Truth

  • November 19, 2018

• S2018E48 Horses

  • November 26, 2018

• S2018E49 Why Do Men Love Sheds?

  • December 3, 2018

• S2018E50 Why do we Collude with Corruption?

  • December 10, 2018

• S2018E51 Wine

  • December 17, 2018

• S2018E52 Musical Instruments

  • December 24, 2018

• S2018E53 Zombies

  • December 31, 2018

Season 2019

• S2019E01 Extreme Sports

  • January 7, 2019

• S2019E02 Fitness Apps

  • January 14, 2019

• S2019E03 Giving Presents

  • January 21, 2019

• S2019E04 Smart Speakers

  • January 28, 2019

• S2019E05 Blame

  • February 4, 2019

• S2019E06 Speed

  • February 11, 2019

• S2019E07 Meritocracy

  • February 18, 2019

• S2019E08 Why is architecture so big on Instagram?

  • February 25, 2019

• S2019E09 Beauty pageants

  • March 4, 2019

• S2019E10 Fattism

  • March 11, 2019

• S2019E11 Fathers and daughters

  • March 18, 2019

• S2019E12 Mothers and daughters

  • March 25, 2019

• S2019E13 Why do stories matter?

  • April 1, 2019

• S2019E14 Cinderella

  • April 8, 2019

• S2019E15 Separating the art from the artist

  • April 15, 2019

• S2019E16 Why is climate change so politicised?

  • April 22, 2019

• S2019E17 Emotional labour

  • April 29, 2019

• S2019E18 Why do we find it hard to cut our losses?

  • May 6, 2019

• S2019E19 Confidence: Why it misleads us

  • May 20, 2019

• S2019E20 Confidence: How it can help us

  • May 27, 2019

• S2019E21 Why is it so hard to get people to pay tax?

  • June 3, 2019

• S2019E22 Why do people risk death in pursuit of adventure?

  • June 10, 2019

• S2019E23 Why do we care where we come from?

  • June 17, 2019

• S2019E24 Why aren’t more women in computer science?

  • June 24, 2019

• S2019E25 Schadenfreude

  • July 1, 2019

• S2019E26 Why should we work together?

  • July 8, 2019

• S2019E27 Why do some people become hermits?

  • July 15, 2019

• S2019E28 Why do we care so much about games?

  • July 22, 2019

• S2019E29 Why does nature calm anxiety?

  • July 29, 2019

• S2019E30 Why do we blend?

  • August 5, 2019

• S2019E31 Why do funerals matter?

  • August 12, 2019

• S2019E32 Why learn to be happy?

  • August 19, 2019

• S2019E33 Why do we (still) wear make-up?

  • August 26, 2019

• S2019E34 Why are we so gloomy about the world?

  • September 16, 2019

• S2019E35 Why do some people reject society?

  • September 23, 2019

• S2019E36 Why do we love camping?

  • September 30, 2019

• S2019E37 Intuition: Why should we trust it?

  • October 7, 2019

• S2019E38 Intuition: Why should we be cautious of it?

  • October 14, 2019

• S2019E39 Why are we shy?

  • October 21, 2019

• S2019E40 Why are we conscious of so little?

  • October 28, 2019

• S2019E41 Why are we conscious?

  • November 4, 2019

• S2019E42 Why do we cheat on our partners?

  • November 11, 2019

• S2019E43 Why grandparents are important

  • November 18, 2019

• S2019E44 Why do we need to talk about men?

  • November 25, 2019

• S2019E45 Why does music affect the way we feel?

  • December 2, 2019

• S2019E46 Resilience

  • December 9, 2019

• S2019E47 Parties

  • December 16, 2019

Season 2020

• S2020E01 Victim blaming

  • January 6, 2020

• S2020E02 Dystopias

  • January 13, 2020

• S2020E03 Why do physical scars matter?

  • January 20, 2020

• S2020E04 Why do we text instead of talk?

  • January 27, 2020

• S2020E05 Millennials and business

  • February 3, 2020