I've been fiddling with this issue for almost 8 hours and I gave up...
Check the images; my client wants a Bootstrap-grid that has two columns (or at least they must look like columns).
On bigger screens, you see two columns - contain DIV's with different (and dynamic) height.
On a small screen, the columns must disappear and the DIV's must be placed from "A" to "Z" (well... "F" actually).
How it this technique called? Or how can I get this done, using Bootstrap 3 - but without CSS3 (Android 4 must support it) or JS / jQuery?
I've been playing around with the pull-left / col-md-push-6 / etc... classes, but the biggest problem is that each DIV has a different height and you never know what the height is.