The user wants a Binance Square post explaining flash loans. Requirements:
- No markdown
- Start with "Crypto Term of the Day:"
- 120-160 words
- One simple everyday analogy
- Explain why crypto investor needs to understand
- End with "Save this post and share it with your crypto friends!"
- Final line: #Ethereum #ETH #CryptoEducation #Blockchain
- No extra commentary, just the post text.

We must count words roughly. Let's aim ~140 words.

Write in plain text, no markdown. Use simple analogy like "like a library book you must return before leaving the building". Explain flash loans: borrow large amounts instantly, must repay within same transaction, no collateral. Why investor needs to understand: arbitrage, liquidation, risk, smart contract vulnerabilities.

Word count: Let's draft ~140 words.

Count words manually.

"Crypto Term of the Day: Flash loans let you borrow millions of dollars without any collateral — but only for the few seconds a single blockchain transaction lasts. Think of it like checking out a library book that you must return before you step outside the building; if you don’t, the whole loan is cancelled and nothing changes. In practice, a smart contract flashes the funds to you, you execute a strategy such as arbitrage or liquidation, and you repay the principal plus a tiny fee all in the same block. If repayment fails, the transaction reverts and the lender never loses money. Investors need to grasp this because flash loans power high‑speed arbitrage, can trigger cascading liquidations, and expose protocols to novel attack vectors. Understanding the mechanics helps you spot opportunities