Overview: AT&T and N. W. Ayer were apparently somewhat dissatisfied with the first two Warner films, and unsuccessfully approached Capra about bidding on production of Thread of Life and About Time. Thread of Life is about heredity, DNA and how it works. The screenplay was by Rowland Barber, a writer perhaps best known for the 1960 novel The Night They Raided Minsky's. Owen Crump directed; Robert McKimson directed the animation.