For anyone that is interested in Ethereum and are either trading Ether or creating DAPPs. This is a must watch video of a Q&A Session that a programmer for Casper, which is Etherium's Proof of Stake Smart Contract.
It highlights a lot of the rules and philosophy that will allow Etherium's Proof of Stake concept to work.
I am working on a simple animated explanation of Casper and what is to come with Etheruem and project Metropolis, so please follow me if you're interested in cryptocurrency and want to learn more.