Covid-19 infodemic reveals new tipping point epidemiology and a revised R formula. - Neil F. Johnson 002; Nicolas Velasquez; O. K. Jha; H. Niyazi; Rhys Leahy; Nicholas Johnson Restrepo; Richard F. Sear; Pedro D. Manrique; Yonatan Lupu; P. Devkota; S. Wuchty (CoRR, 2020)