The big 3 each took turns climbing up over the past week. Last week, Bitcoin soared, then litecoin followed, but today it's all about ether!At the time of publishing this article Ethereum is sitting at $750.There's no one clear reason for today's spike - although there's many possibilities. New investors flooded in to Bitcoin over the last couple weeks, and naturally, after people get their start in Bitcoin they start researching other coins - and learn Ethereum is part of most seasoned investors portfolios.Then, there's also the buzz over Ethereum's pending upgrade, called Casper - expected to hit soon. We talked about Casper a few weeks ago