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![University of Oregon scientists used real dust from inside homes around Portland to test the effects of sunlight, UV light and darkness on bacteria found in the dust.](https://woub.org/wp-content/uploads/2018/10/ray-of-light-04b93c022f3f58ba1a5f0492d1d612cd990c84f3-e1539878882587-900x422.jpg)
Grandma Was Right: Sunshine Helps Kill Germs Indoors
By: Kathleen O'Neil | NPR
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All kinds of bacteria live with us indoors, and some can make us sick. A new study shows that rooms exposed to light had about half the live bacteria found in rooms that were kept in darkness.