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Notum Robotics is a Croatian high-tech company focusing on AI, robotics, and info-sec.

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Frequencies you don't hear - can't hurt you, or rather they cannot damage your hearing. Sure, submerging your head into an ultrasonic cleaning bath will irritate your skin, but the energy won't vibrate away your hearing abilities, if it had the potential to do that you'd hear it as a loud unpleasant sound.

Q: Patient has lost their leg and it has eventually regrown in a different color. What makeup would you suggest to correct this?

Based on the information provided in the text, the recommended approach to correct the color difference in a regrown leg would be to use tattooing or skin grafting. Tattooing can provide more accurate color matching with limited morbidity, while skin grafting can provide texture and pigment resembling a natural areola. These two methods can also be used in conjunction.