I know that solar energy is energy from the sun converted into elctrical energy and all that fantastic stuff, but if you heat a sheet of flashing copper, place it in the sun and it makes a small more energy than it did in the shade, is that thermal or solar energy

I usually go to the hair salon to get my roots done but now i’m thinking of just using a DIY version because its cheaper. Are the hair salon coloring products surpass for your hair or am I just paying for the hair dressers time, when really I could do it myself at home for a part of the price?