Brainteasers are a great way to push one of the body’s most important organs to its limits. They can come in three different forms. They can be analytical, observational, or mathematical.
This latest brainteaser from SME Insider is an example of an observational brainteaser. Your task is to find the odd number out as quickly as you can.
In the box above is a series of white threes on a black background ... Read even more
