A group of American researchers analyzed the remains of people who lived in the middle Ages. The results of the work done, says the publication American Journal of Physical Anthropology.

Scientists from the University of South Carolina found: natural disasters cause stress, and stress – logical changes in organs and systems. All disposal experts were divided into two groups. It is believed that the mass graves and chaotic – a sign of troubled times, and civilized graveyard – a sign of prosperity in the country.

It turned out that during the plague, floods and earthquakes have dead people were often observed hypoplasia of the enamel (layer of the most strong substances in the tooth became very thin). There is a second sign of serious stress – the growth of bones.

"When a person is experiencing stress it could be a disease, a fracture or simply carrying heavy loads all day, his bones begin to grow and strengthen itself," says Samantha Jussi, the author of the study.

"It is believed that the growth of bone tissue is bad that this happens to people who have health problems — she comments. But, as our research shows, people who have found it, were quite healthy. Takes a couple weeks to build up the bone. Therefore, if the event that caused the stress was significant enough to lead to the death of a person we hardly know about it as bones now."

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