Are organic foods more nutritious than conventionally raised ones? Stanford University scientists cast doubt on that concept last year in a widely publicized report. But the gritty little secret is that whether your apples and spinach are organic or not, nutrient levels can vary dramatically depending on growing conditions, such as soil type and quality, temperature, and days of sun versus rain. As a consumer, you have no independent way of verifying that you have chosen a superior batch. But what if you had a handheld scanner that would allow you to check nutrient density? “You could compare carrots to carrots,” says Dan Kittredge, executive director of the Bionutrient Food Association, which is raising the funds to research such a device. “If this batch is a dud, pass. If the next one is good, that's where you spend your money.”