60 Minutes watches a high-stakes one-loft pigeon race in Portugal. Months earlier, pigeon breeders, known as fanciers, shipped their best young prospects to the race loft so the pigeons could learn to recognize it as their home. Each of the 3,300 pigeons is tagged and scanned into a database, then transported 300 miles away and released. Six hours later, the first pigeons find their way back to the loft. The first into the loft wins the largest share of the $1.2 million purse. #pigeon #pigeonrac

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System Design: Building a Bulletproof Payment Gateway! 🚀 Basic payment setups fail during network timeouts. To block catastrophic duplicate charges, enforce client-generated idempotency keys (UUIDs). The server saves this key first; if a duplicate request arrives, it immediately returns the cached result instead of re-charging the buyer. Never overwrite database rows to update payment statuses. Instead, implement an immutable ledger where every state change—authorized, captured, or refunded—cre