Reply to Hedges et al.: Accurate timetrees do indeed require accurate calibrations Morris, Jennifer L. ; Puttick, Mark N. ; Clark, James W. ; Edwards, Dianne ; Kenrick, Paul ; Pressel, Silvia ; Wellman, Charles H. ; Yang, Ziheng ; Schneider, Harald ; Donoghue, Philip C. J. Abstract Publication: Proceedings of the National Academy of Science Pub Date: October 2018 DOI: 10.1073/pnas.1812816115 Bibcode: 2018PNAS..115E9512M