During one week in 1946, 14,000 babies were born in Britain. From their first breath to old age, scientists have tracked and recorded the lives of each one. New cohorts of babies have been added multiple times over the decades. At this point, there are five generations participating in the study. And the total number of participants is 70,000 and counting! That adds up to a boatload of data. It’s enough data, in fact, that the research has generated over 6,000 academic articles and books. These are some of the best-studied humans in the world!