So a camera watching a gate through which only a dozen people pass each day would appear to be a much busier gate, with a dozen people using it in a few seconds.

ECONOMIST: Monitor

When a traveller enters an airport with one of these smart cards, sensors read the passenger's card and automatically send a gate number and electronic boarding pass to the passenger's smartphone.

BBC: In brief: Ash cloud threatens UK flights

In addition, passengers must be prepared to present a local, state, or federal government-issued identification card at the boarding gate, along with the boarding pass.

CNN: FAA imposes new luggage restrictions

After then checking in as normal at the same kiosk, passengers can pass through a miSense automatic security gate by placing their finger on a scanner and inserting their boarding card into the reader.

CNN: Heathrow tests biometrics

Tamalpais in Marin County -- just on the other side of the Golden Gate Bridge -- a seemingly adult way to pass the time.

CNN: A mancation failure in San Francisco

There was much more at stake for them than there had been for the Groton grads of an earlier day. (How many hours do you think they put in doing homework?) College was a gate through which, once, only the favored could pass.

NEWYORKER: Live and Learn

To get there, you have to pass a row of splendid shikumen (traditional stone-gate houses) , and the old-Shanghai textures continue once inside, with red-brick interior walls and reproduced stone gateways above doorways to rooms which are simple, but smart.

BBC: The sharpest rooms in Shanghai

Some of the best birding spots turn out to be smack in the middle of the most peopled places, like Philadelphia's Fairmount Park, San Francisco's Golden Gate Park and New York's Central Park, where well over 200 of America's 750 bird species pass each spring and fall as they migrate.

FORBES: Wings of Desire