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, the Flint water crisis, Nasdaq's botched handling of the Facebook IPO, the accidents of the space shuttles "Challenger" and "Columbia", the electronic trading meltdown of Knight Capital, the crashes of flights ValuJet 592 and Air France 447, and the June 2009 Washington Metro train collision. <unk>, the Flint water crisis, Nasdaq's botched handling of the Facebook IPO, the accidents of the space shuttles "Challenger" and "Columbia", the electronic trading meltdown of Knight Capital, the crashes of flights ValuJet 592 and Air France 447, and the June 2009 Washington Metro train collision. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️