Quartz-based watches keep time because a battery gives the quartz crystal a jolt of electricity to keep it vibrating, thus keeping the hands moving.
The Engineer Guy: How an Atomic Clock Works, and Its Use in the Global Positioning System (GPS)
$800,000 watch tells perfect time
Greubel Forsey, a Swiss watchmaking startup, is pushing the boundaries of precision. For $800,000, you can buy a mechanical watch that tells near-perfect time.
STRESS RELIEF — 3D-print your laptop
Using PLA filament, a small London-based team have managed to achieve the 3D printing of their own Raspberry-Pi-based laptop, with a battery life of six to eight hours and Wi-Fi enabled out of the box.
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3D printed biogel
Stretchable, biocompatible hydrogels with complex patterning could be used in tissue engineering.