written and researched by Oliver Berry [and nine others] written and researched by Sara Benson and 6 others. this edition written and researched by Oliver Berry [and 11 others]. this edition written and researched by Oliver Berry [and 12 others]. written and researched by Andrea Schulte-Peevers [and five others] written and researched by Anthony Ham [and seven others]. written and researched by Sarina Singh [and others] written and researched by Adam Skolnick [and three others]. this edition written and researched by Abigail Blasi [and nine others] written and researched by China Williams [and 9 others].