crakpot

What I have always found fascinating is the colour others perceived at a certain wavelength the same named colour I see say for example I am told the sky is Blue but its my brain that dictates colour to the wavelength perhaps for others they perceive another colour it could be to me post box Red but they still call it Blue

Hi I would think 14 inches of still air was a good insulator Why fill it, at the end of the day heat only moves via convection, conduction and radiation all insulating materials for the first two just stop air movement crakpot