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| | | | | | | | | | | | | | Explorer: The Angel Effect | - NEW - TUESDAY at 10P et/pt | | A 9/11 survivor, an astronaut, and a blue hole diver all survived different traumatic events only to tell strikingly similar stories: each felt a mysterious presence that guided them to safety. Can they be explained? Watch a Preview >> | | | | | | | | | | | | | | Hooked: River Sharks | - NEW - FRIDAY at 9P et/pt | | Today, a shark species is making headlines with stories of sightings and attacks but far inland: the bull shark. With its special ability to tolerate freshwater, the bull can go where virtually no other shark can: upriver. Watch a Preview >> | | | | | | | | | | | | | | | | Great Expeditions: Walking the Great Wall | - NEW - SATURDAY at 8P et/pt | | The Great Wall of China is one of the world's most famous constructions, but it is still one of the least understood. Watch a Preview >> | | | | | | | | | | | | | | | | | | | | | | | The Camera Obscura Technique Photographer Abelardo Morell's camera obscura turns darkened rooms into magical landscapes. See How to Do It Yourself >> | | | | | | | | | 20 Surprising Species of the Past 20 Years From the "Yoda bat" to a "walking" shark, see 20 new and rare species spotted during the last two decades. View Photos >> | | | | | | | | | | | | | | |
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