Trilobites: Why Does Fall Foliage Turn So Red and Fiery? It Depends. Many of the hypotheses for why leaves turn red before they fall off trees in the autumn sound contradictory. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:A.I. Shows Promise as a Physician AssistantSpaceX launch MAPPED: The STAGGERING journey Starman and the Tesla have taken REVEALEDSpaceX launch WATCH AGAIN: See Musk's Starman Tesla BLAST into space again - video HEREApocalypse WARNING: Insect EXTINCTION could have serious threat to HUMAN survivalSpaceX launch schedule 2019 dates: Elon Musk firm to launch Falcon 9 NEXT WEEKCity skies to be dominated by FLYING TAXIES - researchers predict 23,000 by 2035