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(PhysOrg.com) -- The problem exists on both a large and a small scale, and it even bothered the ancient Egyptians.

What would be a case for the repair shop for a car engine is completely normal for a micro engine. If it sputters, this is caused by the thermal motions of the smallest particles, which interfere with its running

Porsche has only five distinct models, but the Stuttgart-based automaker is famously devoted to subtle (and not-so-subtle) diversity. There are four versions each of the Boxster, Cayman, and Cayenne, and the 911 boasts a staggering 23 variants, from the $79,000 Carrera to the $245,000 GT2 RS. And the newest name ...