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Currently Playing: Why earning an "A" at Harvard is about to get harder

Today on CNN10: We'll break down the science behind El Niño, and learn what the coming "Super El Niño" could mean for weather patterns worldwide. Then, we'll learn why earning straight A's at one of the nation's top schools is poised to get harder, before taking to the sky for a harrowing hot-air balloon rescue you'll have to see to believe! All this and more on today's CNN10!