If you've ever colored Easter eggs -- I mean the old-fashioned way, with food-coloring, not with those plastic wraparounds -- then you know that when you mess up, you have two options: rinse them off with some white vinegar and start over, or forge ahead, layer even more color on top, and hope that something presentable emerges.
Okay, so that metaphor's a bit of a stretch, but that's what came to mind when I read, earlier this week, that scientists at the University of Nebraska, Lincoln, have engineered a new category of transgenic crops. The new plants -- which include broad-leafed greens such as soybeans, tomatoes, and tobacco -- harbor a bacterial gene that makes them resistant to an herbicide called dicamba.
"But we have Roundup!" you cry. "Why do we need anything else?" Well, because Roundup (active ingredient: a chemical called glyphosate) isn't working as flawlessly as it used to. According to the story in Science (sorry, subscription only), 24 percent of farmers in the northern Midwest and 29 percent in the South say they have glycophate-resistant (GR) weeds. Crop scientists in Argentina, Brazil, and Australia report GR grasses popping up too.