The she-demon was laughed off as a hoax. The giant alicorn in the sky firing lasers was dismissed as a clever prank. Despite all the weirdness going on at Canterlot High, the scientific community at large has mostly ignored them, and that's suited the Rainbooms just fine.
Unfortunately, they've failed to account for one important outlier. Twilight Sparkle. The other Twilight Sparkle that is...
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With thanks to MisterGunpowder for proofreading and editing.