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Explain blockchain as a pizza delivery system:
Imagine each pizza order is a "block" of information. When you order, instead of just one delivery person knowing about it, EVERYONE in the neighborhood gets a copy of your order (but not your credit card details!). When the pizza arrives, all neighbors verify and agree "Yes, that pizza was delivered." This gets recorded in everyone's copy of the delivery log. If someone tries to claim "that pizza was never delivered," they can't fool the system because everyone else has proof it was. That's blockchain: a system where information is verified by a network rather than a single authority, making it nearly impossible to cheat or hack!
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