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In 2009, North Korea did a clandestine nuclear test that took place one kilometer underground. This approach to nuclear testing by rogue nations has often been difficult to track and monitor because, well, they take place nearly a mile underground and no radioactive gas or dust is let into the atmosphere. So, it’s the ideal way to do nuclear testing without the rest of the world knowing, right? Well, this all about to change thanks to a team of scientists who determined that GPS data can be used to track and monitor underground nuclear tests.

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Yesterday, President Obama handed out medals to some of the nation’s most distinguished scientists. In particular, he bestowed the National Medal of Science to Rudolf Kalman, who has achieved a number of scientific milestones including the development of a problem-solving procedure that was used during the Apollo missions to navigate and control the vehicles — which ultimately became the foundation for GPS technology as we know it today.

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