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Brains that shrink with old age may be the cost of a life span stretching into the 80s, according to a new study that finds while human brains get smaller with age, the brains of our closest primate relatives, chimpanzees, don't lose volume at all.The findings suggest that the human life span (average length of life of an organism) isn't just an extended version of the life span of other mammals, said study researcher Chet Sherwood, an anthropologist at George Washington University in Washington, D. Instead, humans seem to experience old age in a unique way.In the wild, Sherwood said, chimps are usually dead by 45.
Then Richard Leakey found a skull (called KNM-ER 1470) the KBS tuff, a skull that looked far too modern to be 3 million years old.
In chimps of equivalently old age, the new study finds, there is no shrinkage at all.
Sherwood and his colleagues compared magnetic resonance imaging (MRI) scans of the brains of 87 humans ages 22 to 88 with MRI scans of 69 chimpanzees from the Yerkes National Primate Research Center in Atlanta. The researchers also examined the brains of deceased chimps as old as 51.
Restoration work has begun on one of the last "untouched" buildings on Dublin's quays.
Dublin Civic Trust says the work at 18 Ormond Quay is the "most challenging and transformative" building project its embarked on since the Trust's foundation in 1992.
Tests by other scientists using paleomagnetism and fission tracks confirmed the lower date.