Agathe Labaye and Florian Sumi’s Paris home is a “big diorama.” ...

Nearly 2,000 meters above sea level, a lake in southwestern China is drawing a steady stream of divers. Its pull: challenging diving conditions and the tales of China’s own Atlantis hidden below.

It's no surprise that the bathroom tops the list. But how often should you clean it? The big question is whether a quick wipe ...