Shopping online for DVDs, CDs, books or video games makes it easy to do a fair amount of research before you click “buy.” Reviews, Wikipedia entries and price comparisons are all within arm’s reach, so if you stumble upon something completely new, you can find out a lot about it before deciding whether or not to pay for it. Doing that in a brick-and-mortar store is still possible if you have a smartphone on you, but you’ll be standing there at the shelf for a while if you want to search out all that info manually.