#video on #sorting #algorithms with colors #formina
#biography and obituary of Andrey Astrelin, who discovered the GrailSort #sorting algorithm before dying of glioblastoma multiforme at 47 in 02017. #algorithms
#video demonstrating evolving #neural-networks to control a chaotic inverted double pendulum in simulation by gradually ramping down friction and ramping up gravity as the control circuits get better. Nice earth-tone cartoon UI with muted reds, greens, and yellows for highlights. On one run he only had success after 8 hours. On a later run where he added a penalty for moving the cart too much, only a bit over 2 hours. At minute 20 of the video he ended up with a network with 30 hidden nodes, 321 connections, and I think 28 layers, running at 60 hertz. Later he improved this.
#History of #BSP-tree #algorithms before #Doom. #games
#humor #video by a Japanese-Argentine YouTuber about his culture shock on visiting Argentina after a long time away #formina
very impressive #video of #control of a triple inverted pendulum, going through all possible transitions between two of its eight equilibria, from Embedded Control Lab in Korea.
#video on burr identification and removal in knife sharpening. Explains what a strop is actually for and shows microscope shots of the edge at various levels of magnification. #machining
#video on #electroplating: 200g blue vitriol (Zep root killer), a drop of HCl(aq) (Klean Strip concrete etchant), 50mℓ H₂SO₄ (Zep drain opener), 950mℓ distilled water, and an unspecified brightener not shown. He plates at 0.4 volts, getting about 150-400 milliamps on a Star Trek TNG communicator badge. #electrolysis #materials
#ElAngelito #video on #electrolysis sharpening of steel wires in a stainless steel sugar bowl with a saturated table salt solution. He’s using an inverter arc welder as his power supply set at the lowest amperage. He got thick fencing wire to sharpen to a point in three or four minutes of holding it in the salt water. #materials #manufacturing #bootstrapping
#3D-printing #video on #print-in-place #flexures #mechanisms that shoot a toothpick
#video on an orthopedic screw that costs fifteen times its weight in gold
#video on an electrical edge finder for #machining
#video on #Argentina’s lost opportunities and unreasonably positive expectations for #Milei
#video about #Ukraine withdrawing US-provided Abrams M1A1 #weaponry from the battlefield last year due to their vulnerability to Russian drones. Mostly stock footage, but I think this is a Russian propaganda channel
another #video about #weaponry in the #Ukraine war, with Ukraine blowing up three Russian tanks with drone #weaponry