Few people have heard of it, yet many consider John Blankenbaker's KENBAK-1 to be the first commercial personal computer.

Koss introduced these headphones over 40 years ago, and they remain affordable favorites to this day.

Planisphere Watch: A Very Small Sky

Planisphere
The Planisphere Watch displays constellations visible in the Northern Hemisphere (between 35 & 50 degrees latitude). It successfully blends my fascination with astronomy and horology into one simple device.

To use, turn the bezel so the current time is aligned with the date to determine which major constellations are visible. The watch features a 43mm diameter brass case with a crystal dome lens and rubber band with stainless steel links.

It is a guaranteed conversation starter, but I suspect that a standard rotating planisphere ($11) will prove far more useful in the long run, because a watch face is simply too small to show all but a handful of constellations.

Planisphere Watch [Edmund Scientific]

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