Around the 19th century the government played a negative role in science, allowing "body snatching" as a common practice in medical schools.
The demand for cadavers for human dissection grew, leading to an epidemic of of grave thefts; and those in charge of body snatching were named "<em>resurrectionists</em>" or "<em>Resurrection-Men</em>"; stealing corps from local cemeteries to the anatomy schools for dissection lectures.
Hudson river have a different climate and is not inhabitable by zebra mussels was said by scientist in the 90s. It might be because of increasing water pollution in the Hudson river as their are channels from the cities which meet the river.