Since there's a lot of quoting of studies on this topic, I hope that everyone reads this very informative (and long) blog post by a psychiatrist on SSRIs and their effectiveness:
Definitely agree with this one. It's called Algorithm Specialization on Coursera. I'm now on course 3 and it's definitely helped me a lot in thinking about how reason about algorithms.
Yes it looks like they do deduplication, based on the HTML source:
for (var i in data[yr]) {
var story = data[yr][i];
if (seen_titles[story.title]) continue;
seen_titles[story.title] = 1;
// ...add story to list of stories
};