Data Science covers many areas and therefore requires many skills to be learnt. In todays world, with people leading extremely busy lives, finding time to study and pick up new skills can be prove to be very difficult.
One tool i have found extremely useful, and which can be utilised whilst, for example, commuting (which lets face it, a lot of us do, for long periods of time), is the Podcast.
Below are some Podcasts i have found extremely useful :-
Super Data Science Podcast, by Kirill Eremenko
Machine Learning Guide, by Tyler Renelle
Partially Derivative, Chris Albon