The science of fall
These are the sights of fall: Leaves piled high in the yard, pumpkins engorged on vines, flu shots, bears fattening up, shooting stars and the harvest moon ... Each November, Earth passes through streams of dusty debris shed by comet 55P/Tempel-Tuttle ...http://www.nbcnews.com/id/32955781/ns/technology_and_science-science/t/science-f...








