Nisa Khan is a scientist with a strong focus on lighting and, specifically, LED lighting and its dangers.
LED stands for Light Emitting Diode. It's a type of light source that uses a semiconductor to emit light when an electric current passes through it. LEDs are super efficient, last ages and don't get hot like old-school bulbs. Everybody uses them and they're great. I use them in my studio.
However, as Nisa argues, the convenience comes at a cost.
Everything you were taught about this supposedly deadly virus from the early 20th century is nonsense. A lot of people did die, but not from a pathogen.