A group of scientists and environmentalists are calling for an independent review of the chemicals found in the popular herbicide Roundup.
Agriculture giant Monsanto first started selling glyphosate, the major chemical in Round Up, in the 1970s--but it remains controversial.
A band of environment and public health advocates say the chemical mixed with other ingredients could contribute to the risk of cancer and is due for modern tests.
Fred vom Saal is one of them. He is a professor emeritus of biological sciences at the University of Missouri.