• WordNet 3.6
    • n brain-teaser a difficult problem
    • ***


In news:

Here's a brain teaser: Doctors recommend that for optimal health adults drink between eight and ten cups of water daily.
IT is impossible to climb the stairs of the 1997 French Designer Showhouse and not imagine that you have stepped into a three-dimensional version of a brain-teaser cartoon for Sunday-bored children.
After 10 years of writing Brain Teasers, Dr Sophronia Ward is taking a break from her monthly column to write several books.
In celebration of the success of this column, Dr Ward and her colleagues at Pinnacle Partners want to give you the opportunity to solve this final Brain Teaser.
Answers to November Brain Teaser.
HELSINKI (AFP) — A Finnish mathematician on Monday claimed he had created the world's hardest sudoku puzzle, a brain-teaser which required three months' work and a billion combinations to produce.
They found that men with a couple beers under their belts were actually better at solving brain-teasers than their sober counterparts.
Next month, Bazooka Joe Comics, the colorful gag strips printed on wax paper that have been packaged with every piece of Bazooka Bubble Gum for 58 years, are being replaced with brain teasers.
Pat brings you the news, weather and happenings each weekday morning, and challenges listeners with the Brain Teaser.
Solve this brain teaser using colors instead of numbers.
Everyone who has faced a production problem with a need to solve the problem by using production data can relate to the notion of a brain teaser.
The brain teasers presented here are based on real-world situations that are encountered by workers in manufacturing environments.
It's time for some brain teasers.

In science:

The first time this question appeared in print was in a paper by Cayley, [Cay78], and it became known as the Four-Color Problem, one of the most famous questions in graph theory, as well as a popular brain-teaser.
Chromatic numbers, morphism complexes, and Stiefel-Whitney characteristic classes