Then there are big-ticket items such as pianos, bicycles and computers.

CNN: LITTLE EMPERORS

The bicycles and cars and computers and radios and calculators that inhabit their albums are a friendly lot.

NEWYORKER: Sound Machine

From pedal-powered computers on bicycles, to self-powered soldiers in militaries, Raaijen predicted human power would be developed widely in coming years.

CNN: Are we heading for a human-powered future?

He had one brilliant idea: Equip Stair Masters and stationary bicycles with touch screen computers that allow exercisers to pass the sweaty minutes watching television, surfing the web or listening to music.

FORBES: Sweat equity