How many people have ever lived?

World population

An analysis of human population shows a dramatic increase in recent history. Click on this infographic from Live Science to learn more.

World population

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Exercise benefits for seniors »

Working out in the concrete jungle Even a little exercise may help prevent dementia Here’s an unexpected way to boost your memory: running

Seniors who exercise recover more quickly from injury or illness

When sedentary older adults got into an exercise routine, it curbed their risk of suffering a disabling injury or illness and helped them recover if anything did happen to them.