Longevity is a more complex trait than any individual disease, and, in his opinion, it will not be altered so easily.

ECONOMIST: How to live longer��maybe

One finding of this technique, which is known as genome-wide complex-trait analysis, is that many of the same genetic factors seem to explain why people differ in intelligence in childhood and old age.

WSJ: Intelligence Changes Linked to Genes

Seventeen questions, a full one-third of the test, mine for the trait, challenging applicants to pick the shape that best fits into a complex pattern.

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