Janice Haney Carr, CDC/Flickr (CC BY-NC-SA 2.0)
Lydia Polimeni, National Institutes of Health
TIM LAMAN/National Geographic Creative
Chinese University of Hong Kong
Monarch miscalculation: Has a scientific error about the butterflies persisted for more than 40 years?
(Left to right): bushton3/iStockphoto; Fabrice-Chanson/iStockphoto
Vol 355, Issue 6327
24 February 2017