By Helen Pearson
In March 1946, scientists started to tune millions of kids born in a single chilly week. nobody imagined that this is able to develop into the longest-running research of human improvement on the earth, transforming into to surround 5 generations of youngsters. this day, they're a few of the best-studied humans on this planet, and the straightforward act of staring at human existence has replaced the way in which we're born, schooled, guardian and die. this is often the story of those stories and the extraordinary discoveries that experience come from them. Touching humans around the globe, they're one of many world's best-kept secrets and techniques.