Good Questions: Fly Buzzing, Ketchup & Mushrooms

MINNEAPOLIS (WCCO) -- It's Friday, so we are answering some of your Good Questions from the past week!

Pat from Eagan wants to know: What causes flies to "buzz?"

That annoying, pesky sound you sometimes find diving close to your head is the sound of the fly beating its wings.

As gross as it sounds, houseflies often go after our faces because they want to eat our sweat and oil.

If you see a fly rubbing its legs together, that means it's cleaning itself.

Tess from Chisago City wants to know: Does ketchup need to be refrigerated?

Because of its natural acidity, food experts say ketchup is shelf-stable. However, everyone's favorite condiment can be affected by storage conditions. That's why Heinz and others recommend that it be refrigerated after it's opened.

Dennis from Edina wants to know: Why are there so many mushrooms this year?

Mushrooms often appear after several rainy days. If there is the right mixture of moisture, shade or cloudy weather, and organic material in the soil -- mushrooms will grow.

If you don't like your new lawn guests, trim back trees to let in more sun. You can also aerate your lawn to reduce moisture.