In the former USSR there was a table to test the observation.
Its name is "Entertaining table." Note the time and try to find
the numbers consecutively from 1 to 90...
If you can find these numbers in:
5-10 minutes, then you have exceptional power of observation.
10-15 minutes - a good one.
15-20 minutes - the average.
20-25 minutes - it is satisfactory.
