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3 films
A gigantic crater over 180 km in diameter lies beneath the Gulf of Mexico, marking the site of the asteroid impact that caused the extinction of the dinosaurs.
Bear Grylls climbs to 9,500 feet in Copper Canyon, Mexico, where he consumes a venomous scorpion after cutting off its stinger.
More than 80% of US forest fires are started by human activity, yet a video of a cigar-shaped object over California's wildfires sparked widespread intrigue.
