I shared a number of resources about this topic a couple of years ago when it was in the news (see Killing Baby Hitler & Student “What If?” Projects).

We talk about it each year in my Theory of Knowledge classes when studying history – I connect it to our “What If?” projects (see The Best Resources For Teaching “What If?” History Lessons).

Vox produced this video in 2016 when it was in all the media, but I must have missed it.  I just accidentally saw it, and will be adding it to other related resources.