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John D. Cook @johndcook.bsky.social · 14d

@christosargyrop.bsky.social

Kale sales and autism

www.wmbriggs.com/post/58413/

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John D. Cook @johndcook.bsky.social · Aug 5

Looking back at Martin Gardner’s RSA article

www.johndcook.com/blog/2025/08...

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John D. Cook @johndcook.bsky.social · Mar 17

Gluons, quarks, letters, and envelopes

www.johndcook.com/blog/2025/03...

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John D. Cook @johndcook.bsky.social · Mar 9

New post: Practical consequences of LLM tokenization details

www.johndcook.com/blog/2025/03...

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John D. Cook @johndcook.bsky.social · Feb 16

Thanks!

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John D. Cook @johndcook.bsky.social · Feb 13

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John D. Cook @johndcook.bsky.social · Feb 13

Polynomial Encounters of the Third Kind

www.johndcook.com/blog/2025/02...

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John D. Cook @johndcook.bsky.social · Feb 3

Does DeepSeek demonstrate that we don’t need as much compute power as we thought?

www.johndcook.com/blog/2025/02...

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John D. Cook @johndcook.bsky.social · Jan 31

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John D. Cook @johndcook.bsky.social · Jan 16

New podcast interview just dropped.

Protecting Privacy in the Age of AI: A Conversation with John Cook

www.trenegy.com/podcast/prot...

Protecting Privacy in the Age of AI: A Conversation with John Cook

We discuss safeguarding sensitive information in data-intensive industries, the balance of preserving data utility and protecting privacy as AI applications raise new concerns, and methods like differ...

www.trenegy.com

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John D. Cook @johndcook.bsky.social · Jan 1

How the day of the week for New Years Day goes through a 28 year cycle.

The green diamonds represent leap years and the blue squares represent ordinary years.

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John D. Cook @johndcook.bsky.social · Dec 31

Modal logic and science fiction

www.johndcook.com/blog/2022/01...

John D. Cook @johndcook.bsky.social · Dec 27

Unix Time and a Modest Proposal

www.johndcook.com/blog/2024/12...

Unix Time and a Modest Proposal

Why Unix time is not exactly what it is often described to be, and a proposal for fixing it.

www.johndcook.com

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John D. Cook @johndcook.bsky.social · Dec 25

Centered triangular numbers are the number of dots in images such as the one below.

The nth centered triangular number equals 1 + 3n(n + 1)/2.

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John D. Cook @johndcook.bsky.social · Dec 24

Most popular posts of 2024

www.johndcook.com/blog/2024/12...

Most popular posts of 2024

www.johndcook.com

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John D. Cook @johndcook.bsky.social · Dec 20

By the nth day of Christmas, my true love had sent to me n(n+1)(n+2)/6 gifts.

www.johndcook.com/blog/2009/12...

Twelve Days of Christmas and tetrahedral numbers

How many gifts are there in the song Twelve Days of Christmas? Day 1: 1 gift Day 2: 1 + 2 = 3 gifts Day 3: 1 + 2 + 3 = 6 gifts … Day 12: 1 + 2 + 3 + … + 12 = 78 gifts The number of gifts on day

www.johndcook.com

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John D. Cook @johndcook.bsky.social · Dec 19

Intro to interval arithmetic. Applied to cosine iteration.

www.johndcook.com/blog/2024/12...

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John D. Cook @johndcook.bsky.social · Dec 17

If you press the cosine key on a calculator over and over, you always get stuck on the same number.

This post takes a more sophisticated look at a child’s amusement.

www.johndcook.com/blog/2024/12...

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John D. Cook @johndcook.bsky.social · Dec 16

A golden hospital gown is an allusion to The Emperor’s New Clothes, except the emperor is somewhere between sumptuously clothed and naked.

www.johndcook.com/blog/2024/12...

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John D. Cook @johndcook.bsky.social · Dec 9

How many ways can you select six points in the plane so that every subset of three points forms the vertices of an isosceles triangle?

www.johndcook.com/blog/2024/12...