fingernails on chalk board

I learned about fingernails on chalk board in grade 7 from the Screech-halk, my teacher. She did both, dragged here fingernails on the chalk board and screeched in a similar tone. She struck fear into all of us. That was in 1960 ish.

Now there is an individual who does YouTube videos on food addiction that I would like to listen to, but am just unable to listen to, due to her voice, and to me it sounds like fingernails on chalk board.

GMO are raising there web presence. GMO are paying for trolls to put down any claims that GMO should be avoided, as they should be for your health, unless you do not want to be an unpaid lab-rat. Well, at least the protein parts, until they develop enough history, to be demonstrated not harmful to all. Monsanto has a corn that kills in South Africa, or so the story goes, before they silenced the opponent. Monsanto was good at silencing there opposition.  One more example... http://www.foodpolitics.com/2017/06/follow-up-to-gmo-propaganda-film-food-evolution/