TYWKIWDBI ("Tai-Wiki-Widbee")

I found this on Facebook without an answer posted there.  I've put my answer in the comments but am not sure about it.  Would appreciate...

The painting is Street Musicians at the Doorway of a House , by Jacob Ochtervelt (1665).  The pattern on the floor is an example of ...

It just absolutely fascinates me that each of these hexagonal tiles has the same pattern , but that the resultant overall result can be so v...

Certainly you can.  Probably in less than 5 seconds, or you wouldn't be reading this blog. But... one-fourth of incoming University of C...

Lots of these photos on the internet today, for obvious reasons (this one from The Atlantic ).  Am I correct in assuming that the lengths ...

I am recurrently amazed at the wonderful logic and math puzzles posted at Futility Closet .    "You’re in a pitch-dark room. On a tabl...

Ponder for a moment the widespread extent of abysmal ignorance that went into this public presentation.  Someone assembled those data, then ...

I saw this math quiz question today on the theydidthemath subreddit.  Pi is obviously slightly bigger than 3.14, but I didn't know whet...

We've all heard the old adage about monkeys at typewriters, sometimes expressed as a million monkeys (as above, via Savage Chickens ), o...

I wasn't able to do it, but this is solvable using only simple geometry without trigonometry.  The answer is in this video .  Via the Sm...

The example shown, posted on the puzzles subreddit, is on a watch.  What I remember are the old "analog" versions with small slid...

The diagram is NOT drawn to scale, so don't put a ruler on line x to measure the distance.  Figure it out in your head using simple logi...

The circular arrangement is just a design feature, not part of the math.  The puzzle could also have been written out 2,3,4,5,6,8,12...?

Discussion at a puzzles subreddit thread, with best explanation here .

Explanatory diagram here , and some disjointed discussion here .

I had briefly mentioned Belphegor's Prime in a linkdump seven years ago, then found it again today while looking for something else, and...

I got this wrong, which is why I'm posting it.  Answer in this video: Via the theydidthemath subreddit.

I have never seen a pie chart sliced like this one (describing the sexual and racial composition of the American population).  I don't ...

In theory an object travels the longest horizontal distance when it is launched at a 45 degree angle.  But very few home runs come off the b...

Available at multiple places on the internet, where you can find discussions of varying quality.  It's basically a reminder that interes...