The physical decay is evident and these areas suffer all the social problems associated with inner-city poverty.

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Physical decay accounts for much of the problem.

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The physical anthropologist who carried out the examinations, Professor Andrea Cucina said the work could have been done to treat tooth decay, and suggested some plant or other material, which would have since decayed, could have been inserted into the hole.

BBC: Prehistoric dentistry evidence found

Checking data collected at Brookhaven National Laboratory on Long Island and the Federal Physical and Technical Institute in Germany, they came across something even more surprising: long-term observation of the decay rate of silicon-32 and radium-226 seemed to show a small seasonal variation.

FORBES: Radioactive Decay Rates May Not Be Constant After All