<span>I am sure Lincoln had his reason for keeping George Mccellan. I believe his popularity kept him in his position. He must have been able to reach out to the people and had some good ideas. For this reason I believe Lincoln found him useful.</span>
Light energy is quantized <span>It
means that even though light is a wave, it nevertheless exists in
discrete (distinct, countable and indivisible) units, i.e. particles</span>
