BY AMY WESTERVELT
On an average day in 1998, statistician David Fairley was walking up a busy San Francisco street to pick up his son from preschool. Traffic was heavy, and halfway to the school, he started to feel weak and dazed.
“Actually, a homeless guy saw me and helped me to the school,” Fairley said.
“[People at the school] had me lie down for a...
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