At least The history channel will show both sides although it weights evolution. The nails on the chalk board study was junk science. You can tell junk science by its large leaps with no science in between. A study of several individuals showed that certain frequencies made your skin crawl or the hair on the back of your neck stand up.this was a waste of money as it was a known quantity.then just to say the micack monkey makes a high frequency screachy noise as a warning and may be the reason we all hate nails on the chalkboard as it could be from an evolutionary process is a large leap.
Thank you Lesley for reminding my lovely Rebecca and I to watch the bible series.