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Bird Apocalypse

In Arkansas, thousands of blackbirds mysteriously fall to their deaths in an event now called the "Aflockalypse." What led these birds to flee their trees in what looks like a nighttime suicide mission? In Scotland, a clear slime catches scientists' attention. The substance lacks the DNA needed to connect it to life on earth; could it be cosmic? Hear from recent shark attack victims about the rise in the number of attacks. If people aren't a deliberate target, what's motivating them to attack?