# A Hidden Double Acrostic

In the October 10, 1885, issue of Golden Days, a Mrs. Harris contributed the following ingenious verse with two acrostics (one of them is partially hidden) without sacrificing either meter or rhyme: He squanders recklessly his cash In cultivating a mustache; A shameless fop is Mr. Dude, Vain, shallow, fond of being viewed. ‘Tis true […]

# A Challenging Dissection Puzzle

Can you cut the vase in three pieces and assemble them to form a square? Note that the vase is entirely composed of curves. Solution (Click to Show) See Also: Little Octagons to a Big Octagon

# Edgar Allan Poe’s Palindromic Puzzle

The following riddle in the form of a 13-line poem was credited to Edgar Allan Poe. The answers consist of palindromic words: First, find out a word that doth silence proclaim,And that backwards and forwards is always the same;Then next you must find out a feminine nameThat backwards and forwards is always the same;An act, […]

# Multiplying Cells Puzzle

A biochemist is cultivating living cells. Each cell splits into two cells after one minute. One minute later the two cells split to make four, then the four become eight, and so on. Every minute the number of cells doubles. Assume that it takes an hour for one cell to grow until a bottle is filled. If the chemist […]

# The Classic Hourglass Puzzle

Here is a classic puzzle. Say that you have two hourglasses of different sizes. The bigger hourglass runs for 11 minutes while the smaller one runs for 7 minutes. Using these two hourglasses, how can you measure 15 minutes exactly.?

# Primes That Do Not Generate Primes When Any Single Digit Is Prepended

Giving a quick inspection at the list of prime numbers, you’d notice that 2 is the first prime number. However, prepending any single decimal digit to it would not produce other primes, that is, 12, 22, 32, 42, 52, 62, 72, 82 and 92 are composite numbers. Likewise, the third prime number, 5, also shares […]

# Removing The Cherry In The Cocktail Glass: A Match Puzzle

Here is a creative match puzzle by Martin Gardner. Suppose that the four matches in the illustration above represent a cocktail glass. The objective of this puzzle is to remove the cherry from inside the glass without touching it. Also, you can only change the positions of two of the matches. The glass can either end […]

# A Little Riddle

Here’s a little riddle from Don Lemon, Everybody’s Illustrated Book of Puzzles, 1890: Twice six are eight of us, Six are but three of us, Nine are but four of us, What can we possibly be? Would you know more of us? I’ll tell you more of us. Twelve are but six of us, Five are but […]