LiquidPiston has invented a new rotary type engine that is piston-less, valve-less, and weighs only four pounds. They published a proof of concept video for the XMv3 engine, shown powering a small go-kart, that builds evidence that the High Efficiency Hybrid Cycle (HEHC) engine could be the compact, energy-efficient engine of the future.

I’ve been reminded lately of one of the most frightening man-made beasts, glancing over my shoulder and shuddering at the sound of any loud, mechanical whirring. If you thought humanoid bipedal robots were nightmarishly creepy, wait till you see the video below. I remember pictures of the DARPA ‘BigDog’ military troop support robot years ago,…