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This is Scientific Americans' 60-second science. I Karen Hopkin. Living with your parents has its

benefits, at least when it comes to raising your kids. They are grandkids. Because two new studies

add to the evidence that grandmothers can enhance the survival of grandchildren. That is, unless

grandma's too old or lives too far away, the results appear in the

journal Current Biology. Humans are unusual, and that the females live long past the age at which

they stop having babies. We don't really see that in nature. Most of the organisms will reproduce

up to their very last moment. Patrick Bergeon, Professor of Biology at Bishop's University in Quebec.

This increase in post-reproductive longevity is often explained by the so-called grandmother

effect.

Because family members shared their genes, there could still be a benefit for postmenopausal

woman to increase their genetic footprint by helping their daughters to rear larger families.

To explore the grandmother effect hypothesis, Bergen and his colleagues examined nearly 200 years

worth of French-Canadian population records from the 17th and 18th centuries.

At the time life was tough. In some years, the thirds of the kids were not even making it to one

year of age.

But the researchers found that having a grandmother still alive was a definite plus.

Families with grandmothers' lives were larger by about two, and the survival of these

...