two tickets for the danish public transport system, for residents and for tourists, with some desired and undesired side-effect, depending what your interests are:

officially tourists should aim for the single ticket with rfid: called "milfare ultralight". no cryptography, but also more expensive than the normal one and no discount for seniors, but after all that seems less important.

the other ticket solution seems to be for residents: provided with the "milfare classic chip", cryptography is added as money can be stored: anyhow: hacked

The first reported attack was designed by two students at the University of Amsterdam, Pieter Siekerman and Maurits van der Schee. They analyzed the single-use ticket and showed its vulnerabilites in a report. They also showed how a used single-use card could be given eternal life by resetting it to its original "unused" state. For this work they won the Joop Bautz award. | Andrew S. Tanenbaum

what have been hips, tummy and chest measurement in the old days sounds nowadays like this: 1,024 opteron processors x 128 graphical display units x 450 terabytes of storage, generates 245 million pixels.

catalogue name: hyperwall-II, build by nasa | via technews, acm

why don't you get off the computer and watch some tv? | out of print

but then, it was around 1973 that computer manufactores began to publish the slogan: paperless office. yet it didn' lead to the demise of newspapers, just of punch cards.