A couple people have mentioned that the Roundup formula changes every year. Where did that idea come from? Roundup's active ingredient is glyphosate, aka N-(pho

A couple people have mentioned that the Roundup formula changes every year. Where did that idea come from? Roundup's active ingredient is glyphosate, aka N-(phosphonomethyl)glycine, and it's been that way since Roundup was introduced in the 1970s.