Have a few hours to kill? Of the many activities you can do to fill the time, doing a jigsaw puzzle is one of the more nostalgic and analog pastimes. Not only are they stimulating, but puzzles ...

Lakhani, Karim R., and Lars Bo Jeppesen. "Getting Unusual Suspects to Solve R&D Puzzles." Forethought. Harvard Business Review 85, no. 5 (May 2007).

Liberty Puzzles in Boulder created a modern twist ... “This twin-engine jet not only offers the unique feature of handling unpaved runways but is also distinguished by its exclusive design ...