Links

https://www.youtube.com/watch?v=GFLa1b1juUo Aaed has made a few great videos centered around his robot dog and this one is no exception making another dog on a much tighter budget
https://youtu.be/IFqI11SIGXo?si=3qctTgJNPX3Vh0eg normally when you think of steel you think a solid monolith of a material, but there is more under the surface
https://thereader.mitpress.mit.edu/the-genius-of-the-barn-owls-feathers/ owls are incredibly quiet fliers, this video does a good job comparing them to other birds. We often think of bats when it comes to hearing, but this article shows how owls use that sense extensively too.
https://mechanical-pencil.com/ This is a fun well illustrated website showing the detail inner workings of common mechanical devices
https://www.youtube.com/watch?v=7u5S42VUU38 Injection molding is used to make all types of things, odds are any mass produced plastic item will have parts that started with an injection mold. But they are also very tricky to get right, and this video shows some of the pitfalls of perfecting the process
https://protortyp.github.io/posts/can-you-stop-a-hypersonic/ Hypersonic missiles are a fairly new development, this goes into some of the details of how tough a problem it is to stop them

Cool historical fact

https://www.airships.net/hindenburg-smoking-room/ Of course we’re all aware of the end state of the Hindenburg, but did you realize that it had provisions for a room dedicated to smoking… under a balloon filled with enough hydrogen to fill up 80 Olympic sized swimming pools.