wendy walsh. this segment of our program is about roundup weed and grass killer. so, dr. wendy, can you tell us about the problems our viewers should be aware of if they have been exposed to this product? - sure, tony, now roundup weed and grass killer is manufactured by monsanto company and it's a company recently acquired by bayer for over 60 billion dollars. it was introduced in 1974 as a way to kill weeds while leaving crops and plants in tact. and it sold in 160 countries worldwide, it's one of the most popular herbicides on the market with over 1.4 billion pounds used every year. now, the problem with the product is that it's been designated by the world health organization as a probable human carcinogen. because its main ingredient, glyphosate, is a carcinogen that's said to cause non-hodgkin's lymphoma. now today, roundup is sprayed on nearly every acre of corn, cotton and soy beans grown in the united states. - oh, that's a huge risk factor, for sure, from a product so widely used. so, what is non-hodgkin's lymphoma? - non-hodgkin's lymphoma is a type of blood can