While wristwatches are now a bit of an anachronism (how many people do you know who still wear one?) this one is undeniably cool. Why? Because supposedly, it never stops running. At the heart of this incredibly sophisticated piece of machinery are new solar cells that work in very small devices and off very little light. Couple that with some very slick lithium-ion batteries, and this little gadget is a marvel that combines age-old know-how with modern tech. …