#video by #Segerman about expanding racks, an expanding truss made out of telescoping rack-and-pinion #mechanisms. For varying speeds of expansion in different parts of the truss, he can use different numbers of racks, or he can use proportionally different sizes of pinions (making the teeth of the gears larger or smaller).
#humor #video on tricking wine critics into drinking (and liking) prison hooch.
#video on soldier tips from Ukraine that sound stupid: taping up metal things, not using Face ID, closing one eye for a few minutes before going into the dark, removing batteries from flashlights, scanning right to left, dirtying gear, using a green notebook, freezing instead of fleeing, not looking up with your face uncovered, carrying paracord, improvising a tracheotomy, counting footsteps, leaving your boots untied, dirtying your gear, etc.
#video on #mechanisms with unreasonable gear ratios so a tiny little DC motor can lift you