deletions | additions       diff --git a/4_Disciplines_What_are_the__.md b/4_Disciplines_What_are_the__.md  index 6fafbb6..bbe6ee5 100644  --- a/4_Disciplines_What_are_the__.md  +++ b/4_Disciplines_What_are_the__.md 
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Week 1 reading: https://en.wikipedia.org/wiki/On_Liberty  What does the acronym PPE stand for in this context? (hint: it's Spoiler: [it's  not personal protective equipment) equipment](http://geotagx.org/project/ebola/)  What is the 4th dimension being added in this year's iteration of the course?