title: what can you do with the gas that is sent to a fall back function
body: <p>am am learning about transfer and send in solidity, and the fallback function. To my understanding, when you send ether to a smart contract, you also send some gas to the fallback function as well. Why is this mechanism in place? I thought gas was used to pay validators, how come there is gas now stored in the contract + what is this gas in the contract used for now? Thanks</p>