"A Smart Contract is simply an algorithm that exists within a (mostly) secure and immutable block chain. If X happens, then Y will automatically happen in response. One application would be a substantial simplification of ownership transfer. For example, the purchase of a car from an unknown buyer. " Q1 - First, is or is not a block chain (e.g., Ethereum) secure? Why or why not? One paragraph only. Q2 - What does immutable mean and how is a block chain (e.g., Ethereum) immutable? Again, one paragraph. Q3 - How might a smart contract facilitate the purchase of a car? What might be the advantages to this approach? One paragraph.