Pulsar: Micro creative coding playground muffinman.io/pulsar

Flip 100 coins, labeled 1 through 100. Alice checks the coins in order (1, 2, 3, …) while Bob checks the odd-labeled coins, then the even-labeled ones (so 1, 3, 5, …, 99, 2, 4, 6, …). Who is more likely to see two heads *first*?

Less than, equal to, or more than one sixth?

And here's a simpler one, with a rather neat solution:

🧠🔥🧠🔥 15 boxes placed as so: A B C D E F G H I J K L M N O Prizes in 2 boxes, chosen randomly. Andy searches row by row (ABCDEFGH..NO) Babs searches col by col (AFKBGL..EJO) Both start at A, each open one box per go More: theguardian.com/science/2024/s… Who reaches a prize first?

What estimates might we come up with from each individual line?

In case you ever wonder what REALLY goes on at bachelor parties…

'Fifty Challenging Problems in Probability' - Frederick Mosteller (1987, PDF): mbapreponline.wordpress.com/wp-content/upl… Python solutions: github.com/sinclam2/fifty…

20 years of teaching maths before discovering why we have the two different set-squares in a maths set. Together they allow for construction of every angle in multiples of 15° from 15° to 180°. Picture found from Facebook - not mine.

A puzzle by Randall Munroe theguardian.com/science/2024/o…

Howdy North America - PUZZLE ME TWICE - my latest book is out today over your way. The UK version THINK TWICE has been out for a month. Full of brilliant counter-intuitive puzzles that you will love getting wrong! Amirite? Get the book and find out! amzn.to/3A0jK1s

So what does the squaring function look like in the complex plane? Cubic? Sine? Reciprocal?

"True understanding comes not from solving one problem, but in solving families of problems in multiple ways, and following the natural questions as far as we can." mathforlove.com/2014/09/three-…

Cycloid Mini DIY by Joe Freedman — Kickstarter kickstarter.com/projects/cyclo…

A cartoon by Paul Noth. #NewYorkerCartoons

Hello, Coxeter. Hello, Conway. It's me, your biographer. I've missed you two. Happy new-editions day! With @princetonupress, and covers by the inimitable Christian Gralingen.

We are excited to announce that CODAP has a new website! Read more about it on our blog and explore the many enhanced resources on the new website. concord.org/blog/get-invol…

Infinite Mac now has a “Macintosh Garden” drawer that allows one-click loading of any of the 20,000 items archived by that site. I wrote up a brief post with some behind-the-scenes details: blog.persistent.info/2024/11/infini…

I don't plan to be post here anymore now that X has become a megaphone for Musk's propaganda and far-right hatred. I'm Daniel Scher on Bluesky.

7 cards face down in a row. Other sides either green or yellow. All the green cards to the left of yellow cards. (All cards green and all cards yellow each possible.) What is the least number of cards you need to turn over to know colors of all the cards?