This is mentorship. This is lineage. This is generational humanity.
This is what a caring teacher, willing to slow down and give time, teaches:
1975 letter from Carl Sagan to high school student Neil DeGrasse Tyson. (via imgur.com)
Carl Sagan: The Earth Day Speech, Animated.
The Most Astounding Fact. {Video: Neil DeGrasse Tyson}
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