This was on TED where it demonstrated using Ultraviolet wavelengths at a particular frequency that didn't cause skin cancer but only killed surface bacteria. ht

This was on TED where it demonstrated using Ultraviolet wavelengths at a particular frequency that didn't cause skin cancer but only killed surface bacteria. https://www.ted.com/talks/david_brenner_a_new_weapon_in_the_fight_against_superbugs https://www.ted.com/talks/david_brenner_a_new_weapon_in_the_... we good