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Farewell Letters

Why do we write farewell letters? And how do we find the words to say goodbye?

• 17 mins

Organ Donation

Why do we donate organs and will we still need to in the future?

• 17 mins

Eye Witness Identification

Mike Williams asks why scientists and courts are so worried about eye-witness testimony

• 17 mins

Unconscious Bias

Why do we make judgments about people without even realising?

• 17 mins

Hoarding

Why do some people fill their homes and their lives with stuff?

• 17 mins

The Family Tree

Why are so many people obsessed with discovering their family origins?

• 17 mins

Why Do Cities Make Us Rude?

Why do cities make us rude? What makes us behave so badly in urban areas?

• 17 mins

The Female Orgasm

Why do we understand so little about female sexual pleasure?

• 17 mins

Revenge

Why did this type of aggressive behaviour evolve? And what purpose does it serve?

• 17 mins

Why do we Get Road Rage?

Why does driving bring out the worst in some people?

• 17 mins

Forgiveness

Could you forgive the person who killed your child or who raped or tortured you?

• 17 mins

Why Do We Make Lists?

From shopping lists to to-do lists 鈥� why do we make lists and what do they say about us?

• 16 mins

Vigilantes

Why do some people take the law into their own hands?

• 17 mins

Carrying Guns

In the countries where it鈥檚 legal, why do people choose to bear arms?

• 17 mins

Regret

Why do we feel regret 鈥� is it right to live with it, or should we get over our mistakes?

• 17 mins

Conspiracy Theory

The Why Factor asks why some people believe in conspiracy theories and whether it matters

• 17 mins

Cryonics

Why do some people choose to be frozen at death, hoping to be brought back to life?

• 17 mins

Torture

Does torture actually work, and can its use ever be justified?

• 17 mins

Hypochondria

What is hypochondria, and why don鈥檛 we take this misunderstood malaise more seriously?

• 17 mins

Smiling

Whether a toothy grin, a megawatt beam or a faint curve of the lips, why do we smile?

• 17 mins

Stammering

Why does this speech disorder cause so much shame amongst the millions affected by it?

• 17 mins

Listening

Why is listening different from hearing? And how can we develop that skill?

• 17 mins

Hands

Whether it is making or fixing something, why do we enjoy working with our hands?

• 17 mins

Why I鈥檓 Not Just Blind

Lee Kumutat asks why blind people must either be inspirational or deserving pity

• 17 mins

Yoga

Valley Fontaine asks why do we do yoga, and how has it become so popular?

• 17 mins

Why do Men Want Six Packs?

Why do men all over the world crave these six bumps on their stomach?

• 23 mins

Clapping

Becky Milligan uncovers the secrets of applause and how it can be used to infect us all.

• 23 mins

Underground

What lures people to delve deep beneath the earth, into the dark recesses underground?

• 23 mins

Why Words Matter

Lane Greene explains how the words we choose can tell us a great deal about ourselves.

• 23 mins

Short

Why do some short people lie about their height?

• 23 mins