Salt and a water-repelling surface. Water near a water-repelling surface is less likely to dissolve salts. (Image: Yoshimitsu Itoh, Takuzo Aida) Surface pollution is a problem that is found everywhere ...

Q: There are white deposits on my chimney, on the face of a retaining wall and on my paver patio. I sometimes see these white crystals near cracks in my basement walls. What are they? Are they hurting ...

Water spritzed from sprinkler nozzles suspended a few feet above the ground, wetting the grass below. The spigots dangled from a center pivot — an irrigation structure that rotates around a fixed ...