In a move to increase safety and guard against possible terrorist attacks, olfactory security checks for explosive chemical substances are being vigorously enforced at a public swimming pool near you. Shanghai's 450 public pools are now required to verify the contents of bottles of shampoo, body wash and other liquids. Applying the principle "the nose knows" pool workers will smell each bottle to make sure it is not harmful—remember, waft, don't inhale deeply. In conjunction with the additional security measures at airports and metro stations that you've likely breezed by, this latest initiative joins the fray of stepped-up Olympic security protocols in our co-host city which will be home to the Olympic soccer tournament. Yes, soccer, not swimming. We're not quite sure what the connection is, but either way, it's time to sniff your way to (water) safety.