Is it true that flies vomit when they land on your food and you can get sick from it? That fly buzzing around your picnic food may seem innocuous, but keep this in mind: It might have been snacking on ...

The surefire way to know whether it’s a sweat bee or a corn fly buzzing around is if it stings. The halictid bee stings, but the corn fly, also called a hover fly, does not. “They’re mimics of bees, ...