The other day I ran across an issue of Scientific American from the late 70s (http://flowcytometry.sysbio.med.harvard.edu/files/flowcytome...) and I was super impressed by the quality and educational value of the content. Much superior to its current version. They have a ton of super interesting "mini" papers about all sorts of topics. In that issue alone I learned about:
- The metabolism of alcohol
- The meteorology of Jupiter
- Simpson's paradox
Take a look at it. I think you might be impressed too.
The other site I have fallen in love with recently is Fermat's Library (https://fermatslibrary.com). They essentially publish an annotated paper every week (usually physics, cs, math). Reading their papers is now a part of my weekly routine.