The gyre that pulls this sunrise ocean moves west from Africa across the equator then caresses this thumb of land on Mexico's flank. The Gulf Stream carries the warm waters farther north. Like the ocean currents, airflow also moves in a circular pattern, captive to the earth's rotation, pulled one way or the other on either side of the equator: the Coriolis effect. This force can act upon the spiraling of water down drains, counterclockwise if you are in the Northern Hemisphere, clockwise if you are south of the equator. We are still in the Northern Hemisphere but just barely. My quest for drain behavior reassures me that we will not be flung off the spinning globe--you can never be too sure. On a flight to Australia once, when the airplane was precisely over the equator, I rushed to the airplane's lavatory and filled the sink with water. Then I pulled the plug to see which way the water would circle the drain, hoping for some sort of momentous turmoil in the physics of deflection. When you venture well beyond home, it is important to assess the territory.