At least two different populations of a parasitic wasp native to Europe have been found on opposite coasts of North America. But no one knows how they got there.
There are all sorts of cruel parasites out there, and more are being uncovered all the time. Scientists have recently found several invasive species of parasitic wasps that have now landed in the U.S.
Researchers at Binghamton University and the Univ... [3875 chars]