A heliotrope, a device used by Prof. Quimby to help in surveying work. It reflects sunlight over great distances and allows accurate angle measurements. Credit: Robert Averill and Kris Pastoriza One ...
India Today on MSN
The genius behind every turn: How Einstein keeps Google Maps accurate
Global Positioning System (GPS) satellites continuously beam down ultra-precise timestamps, each message essentially saying, "It was 12:00:00.000001 when I sent this." ...
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