Catalyst brings a mixture of Australian and international stories, from scientific breakthroughs investigating the implications, the ethics, and the politics of the particular issue, to stories about how scientists work in the field. In this DVD release, the Catalyst team present stories on Parenthood: The science of raising children Part 1-3; Imaginary friends; Fatherhood and the male pregnancy; Teen brain; Fatherhood: secrets of the superdads; Teen alcohol; Sleeping with baby; Stay up late; Baby talk; Taming the problem child; and To drug or not to drug