let's talk about this little guy - an explosive bolt

i've always found these fascinating

🧵 they're also called pyrotechnic fasteners

it works more of less like an ordinary bolt - screw it in and it holds two things together

but it has a tiny explosive charge within that can be detonated on command, cleanly breaking the bolt at its scored weak points

let's talk about these little guys

🧵 this is a retroreflective raised pavement marker

you've seen a million of them

there's a lot more to them than you might think