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That the horrible Zika virus or HIV, we can look at what it means to be patient zero, what it means to need not much contact to spread, and all of those things follow into the way ideas spread.

"What Makes An Idea Go Viral?". "TED Radio Hour" with Guy Raz, www.npr.org. March 4, 2016.
That the horrible Zika virus or HIV, we can look at what it means to be patient zero, what it means to need not much contact to spread, and all of those things follow into the way ideas spread.