He developed technologies that helped pave the way for the Global Positioning System and made foundational discoveries that ...

That's when Dr. Kim learned that during the time Einstein formulated his Theory of Relativity in 1905, all particles were considered "point particles," or particles that do not take up space.

That's when Dr. Kim learned that during the time Einstein formulated his Theory of Relativity in 1905, all particles were considered "point particles," or particles that do not take up space.