Ethereum

• Does Kaleido support nodes on public Ethereum chains?
• If I have a private smart contract that I want to invite a new member of my consortium to, can I expand the scope of the private contract to provide them access to the full 'private' ledger?
• What is a private Ethereum chain? I thought Ethereum was based on the mainnet - how can it be gasless?
• Do I have to pay gas if I choose an Ethereum chain?
• Why the Ether Pool?