Vaccination and Rabbinic Authority: Part 1 - Who is a Gadol?

Consulting gedolim for advice: Who qualifies as a gadol and more fundamentally who is a Talmid Chacham (a halachic question)? On what issues should one consult a rabbinic authority and is one obligated to consult one on all matters or only regarding halachic matters?

Do gedolim have ruach hakodesh?

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Delivered at the OU Israel Center, May 1st, 2019, 26 Nisan 5779