Shimadzu Corp, a Kyoto, Japan-based precision equipment maker, has started selling a clock which is accurate to a deviation of one second over ten billion years. The strontium optical lattice ...

Resembling a squat, wide fridge, the world's most accurate clock went on sale for $3.3 million in Japan on Wednesday. The "Aether clock OC 020" is so precise that it would take 10 billion years ...