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http://pbs.org/thinkwednesday See why survival in the sky depends on more than beating gravity or mastering flight on SUPERNATURE – WILD FLYERS “Crowded Skies.” Then, discover the human story of vast wealth—and lethal risks—hidden in North America’s landscape on NOVA’s Making North America: Human. Then, see how your time in the womb, as your senses mature, has determined your destiny on the outside on 9 MONTHS THAT MADE YOU “The Final Countdown.”

Think Wednesday, Think PBS. Continues Wednesday July 13th at 8/7c