I love this paper! "How big a table do you need for your jigsaw puzzle?" https://arxiv.org/abs/2312.04588
It's quite light-hearted, but takes a real question - how much more space do jigsaw pieces take up when they're separated? - and works through the science step by step. There's a bit of maths in there but it's clearly explained, and you can read the rest of the paper without worrying about those details. 1/2