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.

Chemistry Kit Fun

Chemistry kit

I am living proof that no child under the age of 30 should be given a chemistry set. Upon receiving mine, I set about trying to isolate enough hydrogen to float a large balloon. A day later I discovered just how hard it is to store hydrogen in the presence of an open flame. The black mark on the ceiling measured about 2 feet across -- thankfully my head wasn't in the way.

Thames & Kosmos sells a modern version -- the CHEM C3000 -- should you have the urge to put unsuspecting children through similar rites of passage this holiday season. The kit comes complete with chemicals, a handful of test tubes, an alcohol burner, and an 186-page manual detailing 360 experiments.

2,400 cubic inches of pure chemistry

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