Reinier Kuppens and Wolfslag #paper on a #string-based representation for evolutionary design of dynamical #mechanisms. #toread
#adorable #video of #kittens and a German Shepherd that does not eat them
#video by #Practical-Engineering on #building #tunnels #underground. Almost entirely talking-head filler and stock footage, though there’s a chart plotting unsupported roof span against “stand up time” at 10'17", with “competent rock” of high rock mass rating being able to stand up without support for a long time, not even rock bolts (anchors), much less more advanced supports. #digging
31-minute #video #toread about secret #underground #tunnels in #China