Nobody loves pesticides, exactly. But one kind of pesticide, called neonicotinoids, is provoking a particularly bitter debate right now between environmentalists and farmers. The chemicals are highly toxic to bees. Some scientists think they are partly to blame for the decline in pollinators.
For the past year, the province of Ontario, in Canada, has responded to the controversy with a novel experiment. Ontario's government is asking farmers to prove that they actually need neonicotinoids, often called neonics. It turns out that "need" is a word that's hard to define.