I am not sure exactly how it works, but this is amazingly accurate.
READ THE FULL DESCRIPTION BEFORE LOOKING AT THE PICTURE.
The picture below has 2 identical dolphins in it.
It was used in a case study on stress levels at St. Mary's Hospital.
Look at both dolphins jumping out of the water. The dolphins are identical. A closely monitored, scientific study of a group revealed that in spite of the fact that the dolphins are identical, a person under stress would find differences in the two dolphins.
If there are many differences found between both dolphins, it means that the person is experiencing a great amount of stress.
Look at the photograph and if you find more than one or two differences you may want to take a vacation.
They look fine to me, I can't really see any difference, but you may be different!
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