Enlarge Image Heart attack. Following a big meal, oily nutrients in the bloodstream of Burmese pythons (shown) spur massive growth of their hearts. Credit: Stephen M. Secor At the end of Dr. Seuss' How the Grinch Stole Christmas!, the titular villain undergoes a literal change of heart. His blood-pumping organ swells to three times its prior size. The ticker of the Burmese python (Python molurus) similarly balloons, but the cause isn't Christmas cheer—it's a big meal. A new study of recently fed snakes suggests that a precise mixture of fatty acids in the blood drives this cardiac growth, unveiling...
