India, Maharashtra, Mumbai, Commuters on a crowded suburban train.

India, Maharashtra, Mumbai, Interior of second class carriage of a surburban train.

India, Maharashtra, Mumbai, Interior of second class carriage of a surburban train.

USA, New York, Manhattan, Grand Central Terminal main concourse busy with people and the Stars and Stripes flag hanging down above them.

USA, New York, Manhattan, Grand Central Terminal main concourse busy with people and the Stars and Stripes flag hanging down above them.

USA, New York, Manhattan, Grand Central Terminal main concourse busy with people and the Stars and Stripes flag hanging down above them.

USA, New York, Manhattan, Grand Central Terminal main concourse busy with people and the Stars and Stripes flag hanging down above them.

USA, New York, Queens, seated subway passengers on the E Train all using their mobile cell phones but not making telephone voice calls.

USA, New York, Manhattan, Grand Central Terminal main concourse busy with people and the Stars and Stripes flag hanging down above them.

USA, New York, Manhattan, Grand Central Terminal main concourse busy with people and the Stars and Stripes flag hanging down above them.

Spain, Madrid, Principe Pio Metro Station.

Spain, Madrid, Principe Pio metro station.