Scipsy

do the math (by electrolite)
Your notation sucks (by fatllama)
E= mc^2 (by Rodrigo De Anda)
Pí (by Íris Erlingsdóttir)
A light ray as a twistor (by Ethan Hein)
easy as pi (by ~BostonBill~)
Pi = Que, o cabo e ponta terrestre que previ desde que nasci (by -murilo-)
Eight queens puzzle
The eight queens puzzle is the problem of placing eight chess queens  on an 8×8 chessboard such that none of them are able to capture any  other using the standard chess queen’s moves. The queens must be placed  in such a way that no two queens attack each other. Thus, a solution  requires that no two queens share the same row, column, or diagonal.
The puzzle was originally proposed in 1848 by the chess player Max Bezzel, and over the years, many mathematicians, including Gauss, have worked on this puzzle and its generalized n-queens problem.

Eight queens puzzle

The eight queens puzzle is the problem of placing eight chess queens on an 8×8 chessboard such that none of them are able to capture any other using the standard chess queen’s moves. The queens must be placed in such a way that no two queens attack each other. Thus, a solution requires that no two queens share the same row, column, or diagonal.

The puzzle was originally proposed in 1848 by the chess player Max Bezzel, and over the years, many mathematicians, including Gauss, have worked on this puzzle and its generalized n-queens problem.

Snowflake (8) (by Anthony Smith)