Wikipedia

1) What is a brief history of the encyclopedia? 

An encyclopedia (also spelled encyclopaedia or encyclopædia) is a type of reference work,provide summary information of a branch of knowlegde or a particular branch of knowlegde

2) What are some key features of that encyclopedia

     a) according to Wikipedia 

Four major elements define an encyclopaedia: its subject matter, its scope, its method of organization, and its method of production:

• Encyclopaedias can be general or specfic
• aim to provide true and reliable informtion
• userfriendly organization in order to be a reference work
• easy to get the information

     b) according to Encyclopedia Brittannica

3) Which encyclopedia was most useful for this research?

 Wikipedia 

4) Can you trust this encyclopedia (the one you used) 100%? Why or why not?

It canot be trusted because it is free for us to edit the content.