Loud Linda

Linda is 31 years old, single, outspoken, and very bright. She majored in philosophy. As a student, she was deeply concerned with issues of discrimination and social justice, and also participated in anti-nuclear demonstrations.

Which is more probable?

1) Linda is a bank teller.
2) Linda is a bank teller and is active in the feminist movement.

1) Linda is a bank teller.

Most people guess number two, but the probability of two events occurring together is always less than or equal to the probability of either one occurring alone. This problem is known as the Conjunction Fallacy.

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Break, Light, May

What word can be added before or after these words to make a new word or phrase?

Break, Light, May

Day. Daybreak, daylight, may day.

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Reordered Mistake

What reordered word is a mistake?

Errored, which is an anagram of reorder.

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September 10th In Britain

What happened on September 10th, 1752 in Britain?

Nothing happened that day. It didn’t exist due to the transition from a Julian calendar to Gregorian.

Read more here.

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Bed, Evil, Identical

What word can be added before or after these words to make a new word or phrase?

Bed, Evil, Identical

Twin. Twin bed, Evil twin, Identical twin.

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You Are My Brother

You are my brother but I am not your brother. Who am I?

Your sister.

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Surf, School, Room

What word can be added before or after these words to make a new word or phrase?

Surf, School, Room

Board. Surf board, school board (or maybe boarding school), board room.

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A Voice With No Mouth

I am a voice without a mouth, throat or lungs. I know no language but speak in all tongues. What am I?

An echo.

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Only Found In The Past

You will only ever find me in the past. I am created in the present but the future can never taint me. What am I?

History

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Invisible Walls

What invention lets you look right through a wall?

A window.

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