Researchers at the University of Texas at San Antonio built a robot in 2018 designed to be small enough to help fight cancer and serve other surgical methods. The device was entered into the Guinness World Records as the 'smallest medical robot' as it has a spherical radius of only 120 ______. What very-small unit fills the blank?

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1. Researchers at the University of Texas at San Antonio built a robot in 2018 designed to be small enough to help fight cancer and serve other surgical methods. The device was entered into the Guinness World Records as the 'smallest medical robot' as it has a spherical radius of only 120 ______. What very-small unit fills the blank?