AUSTIN, Texas, Nov. 5 -- Texas A&M University, a component of the public university system in Texas, posted the following news from its agriculture program: * * * The magical chemistry behind nature's fall foliage colors * When summer fades and fall emerges, lush green tree leaves give way to a variety of warm hues that mark the changing of seasons, and many people anticipate the chance to catch a glimpse of the magic. But it's not magic at all, and those brilliant autumn colors have alway  more