deletions | additions       diff --git a/Lecture_4_Guest_lecture_by__.md b/Lecture_4_Guest_lecture_by__.md  index 234fc91..f80228d 100644  --- a/Lecture_4_Guest_lecture_by__.md  +++ b/Lecture_4_Guest_lecture_by__.md 
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What does this mean for Uluru?  Is ice change in the Arctic reflected in the Antarctic? What does this suggest about health in astronomy?