Sorry about the confusion - 'Big Data' is something I haven't delved into at all yet - I'm following a discrete maths course along with JUST getting into Ruby/Rails & Android development. I'm new to CS, and only recently followed along with www.cs50.net last fall. I did, however, ask my brother-in-law, whose main focus is big data in the medical field, about it. I'll post his recommendations if any later on - so check this in a day or so if you can.