X-ray CT scans reveal that jostling a box of mixed nuts nudges oblong Brazil nuts to point more vertically, allowing the bulky nuts to rest on top as smaller ones sink to the bottom, Maria Temming ...
Global Positioning System's atomic clocks are accurate within one second every 32,000 years. That's OK by most people's standards, but not NASA's. They've figured out how to make atomic clocks even ...
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