Dave was the leader of a group of divers I had connected with while on a 1980 sabbatical in San Diego. On one of our dive trips, we crossed the border and drove to Ensenada, Mexico, diving the rocky ...

Maybe collecting shells is a favorite pastime of yours, but you don't know which is a moon snail and which is a mud snail. Or, you're walking along the beach, and something shiny catches your eye, but ...