Welcome back for episode 9. This week we look at homocysteine and the heart, hazards of being part of a youth subculture, genes linked to obesity and chaos theory in Parkinson’s disease. We also have a belated Easter feature complete with eggs and chocolate, discuss 'legless' caecilians and Magnus enlightens us on nanotechnology. The health news has an international feel roaming from Scotland to china, Bangladesh, Canada and the US. Enjoy!