The logic puzzle almost everyone gets wrong

This is a very famous logic problem:

“Jack is looking at Anne, but Anne is looking at George. Jack is married, but George is not. Is a married person looking at an unmarried person?

  • A: Yes
  • B: No
  • C: Cannot be determined”


According to the Keith E. Stanovich in Scientific American more than 80 percent of people choose C, which is not the correct answer. The correct answer is A. Why?

This is another example of a similar problem:

There are only two handshakes in a meeting: John shakes hands with a person, this person shakes hands with Anna. Does a man shake hands with a woman in the meeting?


Project Starters

Challenging puzzlers to create a positive attitude to real projects.

2015 New MENSA Challenges from A+Click

1) Think Outside the Box!AplusclickMensa2015

2) What is the word coiled inside this circle?

A) Animal;  B) Food; C) Country; D) USA State; E) Language


Mensa Tough Puzzle

Tough question from A+Click makes you crazy. 99.9% fail or refuse to solve it.aplusclickQuestion

Study: Motivation Is More Important Than IQ For Succeeding In Math

Think Outside The Box

Thinking Outside The Box or Thinking differently is the first step of innovation.

The slides show 10 examples of such problems.

100 outside-the-box questions are presented at


Dan Hurley: Can You Make Yourself Smarter?

Dan Hurley:

You get better as you practice.

Working memory exercise 20 minutes a day 5 days per week
gives perfect results.