Dramatic recent declines in the size of monarch butterfly ( Danaus plexippus ) roosts during fall migration. Proceedings of the National Academy of Sciences , 2024; 121 (43) DOI: 10.1073/pnas ...

He is a Chartered Market Technician (CMT). Daniel Balakov/ Getty Images An iron butterfly is an options trade that uses four different contracts as part of a strategy to benefit from stocks or ...