Links

https://phyphox.org/ This is a neat opensource app which lets you get pretty low level readings off the multitude of sensors in your cellphone and lets you save/export that data.
https://iamvishnu.com/posts/utf8-is-brilliant-design UTF-8 is the encoding that pretty much all things computers use to transmit characters, but it’s not just some dome A=1, B=2… there was some pretty thoughtful design that went into it.
https://eaglepubs.erau.edu/introductiontoaerospaceflightvehicles/chapter/aerospace-structures/ the fact that airplanes fly is pretty incredible, even the smallest cessna you will see flying is over 1,000lbs, this page does a great job showing some of the key aerospace design princibles that enable flight of even the 1.41 Million pound An-225.
https://www.youtube.com/watch?v=gjT9P1uEyE4 Sticking with the aerospace theme, this is an interesting YouTube channel(thanks james for the link) of a startup designing an airplane and they breakdown a bunch of the aspects that goes into that.
https://www.youtube.com/watch?v=U7NHNT3M-tw Hydrostic’s are weird, Stevin's law is often not immediately intuitive and Steve does a great job showing how it works with some neat demonstrations.
https://www.lumafield.com/learn#resource-articles This is a pretty cool site, the company makes/sells CT machines but every few weeks they post a CT scan of some random thing and it’s pretty fascinating to look at how things are put together without actually taking them apart.

Cool historical fact

https://www.smithsonianmag.com/history/how-the-1904-marathon-became-one-of-the-weirdest-olympic-events-of-all-time-14910747/ All marathons are tough, but you’d be hard pressed to find one with a more unusual group of winners. The first person to finish drove most of the race in a car, the 2nd person was carried across the line by his trainers after being fed rat poison. The 4th Another runner was in dress shoes and pants cut off after he lost everything gambling.