this edition written and researched by Andrea Schulte-Peevers. this edition written and researched by Ryan Ver Berkmoes. this edition written and researched by Iain Stewart and three others. this edition written and researched by Neil Wilson and seven others. this edition written and researched by Korina Miller and seven others. this edition written and researched by Neil wilson and nine others. this edition written and researched by Austin Bush. this edition written and researched by Cristian Bonetto this edition written and researched by John Lee this edition written and researched by Emilie Filou and three others.