If we take all the digits from 1 to 9 and lay them out in order. 123456789 Now repeat the sequence and add it to the end. 123456789123456789 Now let's copy and reverse everything to create a second sequence 987654321987654321 Now we merge both together and wrap them into a circle. So we have 18 d...

It loves to twist and turn, A mystery that men seek to learn. I don't doubt its swag, It can make an ant nag. It takes one so far, And builds a nice bar. It's powers can be seen, When it transforms a barren terra green. ...

Two players, Alice and Beatrice, having previously agreed on a positive integer N (say 30) as a limit, take turns to write a sequence of positive integers. In the first turn Alice writes 1. Thereafter, on the nth turn, whosoever turn it is, writes the previous term plus or minus n, or, if neither...

Can you change this into this in three moves? You are the wizard of subsets. With only your mind, you can grab any subset of the 16 stone blocks and move them one unit in any direction (north, east, south, west). However, you may not cause two stone blocks to occupy the same space. (That'...

I don’t know why I’m making this, but here are 2 crossword clues off the top of my head. (And no, no crosswords for you!) To play rock, paper, scissors agressively? (5, 5) Apolitical reactionist? (7)

Take any scientific calculator and follow these steps: Ensure the calculator is in degrees mode. Enter some number of 5's (more than 4 is ideal). Take the reciprocal of step 2. Take the sine of step 3. You should find that the result is an approximation of $\pi$ (that becomes more accurate as m...