It may seem harmless to sample a berry or two from a clamshell at the grocery store — after all, you just want to make sure they're sweet, right? Yes, and no. Under a microscope, an unwashed berry can ...

Imagine you’re strolling through the produce section at the supermarket, on a quest to stock up on the best berries, cherries, or grapes. Many of these are sold in containers that would make it easy ...