It took me a long time to realize that articles related to a topic can be seen by clicking on the year. This instruction is hidden below the screen fold. It'd also be nice to see actual numbers (along with the %) for each year during hover.

It'd also be useful to see a curated list of topics to select from, instead of just randomly picking some related topics on page load. Hopefully they harvest some interesting suggestions they receive through @nyt. There are some fun topic-suggestions in this thread already.

Overall, a nifty tool that I wish existed for all news sources in the world and worked across all languages.

Thanks to the creator(s)!