My grandmother always told me to wear clean underpants everyday in case I got hit by a car—and to keep my camera lens clean in case I needed to take a good photo. Granted, I made that last part up, ...

Breakthroughs, discoveries, and DIY tips sent six days a week. Terms of Service and Privacy Policy. My grandmother always told me to wear clean underpants everyday in ...

Have you ever noticed small darkish patches in areas of blue sky in landscape photos taken with your digital SLR? They’re probably produced by dust on the image sensor. In most cases, it’s not on the ...