What is the IQ cutoff for Mensa?

98%:A result on one test of 132 can be the same as a score of 148 on another test. Some intelligence tests don’t use IQ scores at all. This is why Mensa k...

What are the primes of 5?

The first five prime numbers: 2, 3, 5, 7 and 11. A prime number is an integer, or whole number, that has only two factors — 1 and itself. Put another way,...

Is a cipher a puzzle?

A cryptogram is a type of puzzle that consists of a short piece of encrypted text. Generally the cipher used to encrypt the text is simple enough that the...

Is knights tour possible on a 4×4?

For example, on a 4×4 chessboard a knight’s tour is also impossible. In fact, the 5 x 6 and the 3 x 10 chessboards are the smallest rectangular boards tha...