[rkagerer]

Here's one I posted today showing how tunnel boring machines work. More civil engineering than science, but I found it quite fascinating: https://news.ycombinator.com/item?id=20364474

[dang]

We've put that in the second-chance pool (described at https://news.ycombinator.com/item?id=11662380) so it will get a random placement on the front page.