How GPS Clocks Work (w/ Hugo Fruehauf) and Why Stress Turns Hair Gray

Learn how atomic clocks and how GPS clocks work, with help from the engineer who made GPS clocks possible: Hugo Fruehauf. But first, you’ll learn about how Harvard researchers finally figured out why stress can turn your hair gray.

Why Stress Turns Hair Gray by Grant Currin

• Zhang, B., Ma, S., Rachmin, I., He, M., Baral, P., Choi, S., Gonçalves, W. A., Shwartz, Y., Fast, E. M., Su, Y., Zon, L. I., Regev, A., Buenrostro, J. D., Cunha, T. M., Chiu, I. M., Fisher, D. E., & Hsu, Y.-C. (2020). Hyperactivation of sympathetic nerves drives depletion of melanocyte stem cells. Nature, 577(7792), 676–681. https://doi.org/10.1038/s41586-020-1935-3
• Clark, S. A., & Deppmann, C. D. (2020). How the stress of fight or flight turns hair white. Nature, 577(7792), 623–624. https://doi.org/10.1038/d41586-019-03949-8

Additional resources from Hugo Fruehauf:

• The Global Positioning System. (2019). Queen Elizabeth Prize for Engineering. https://qeprize.org/winners/the-global-positioning-system
• Elizabeth, Q. (2020). The QEPrize Judges introduce GPS [YouTube Video]. https://www.youtube.com/watch?v=7CH_fmO-QO8&feature=youtu.be
• Hugo Fruehauf. (2019). Queen Elizabeth Prize for Engineering. https://qeprize.org/winners/hugo-fruehauf
• Cozzens, T. (2019, December 3). GPS pioneers honored with Queen’s award at Buckingham Palace - GPS World. GPS World. https://www.gpsworld.com/gps-pioneers-honored-with-queens-award-at-buckingham-palace/
• Hugo Fruehauf Official Website http://hugofruehauf.com/

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