"Seems to be a variant of the northern european Folkrace."

"You don't have Bag-In-Box in the USA?"

"The Uber Volvos got IR-LIDARS and ultrasonic sensors which don't care if it is light or pitch dark outside. The IR-LIDAR should even be better at night because there is no infra red light interference from the sun. There is no excuse to have such sensors and have a car driving around in public if they don't work in all conditions."

"Looks fun but who came up with the idea of a ramp over the concrete wall at 2:50?Miss the ramp and you hit a solid concrete wall straight on.."

"Why don't you have locks on the doors? Here in Sweden it is quite rare with doors with no locks.And why make it so complicated?Just drill a hole in the ground behind the door and have a solid dowel pin nearby.Or use a security hasp?"

"Most likely just electroplating. There have been limits to which metals can be combined and plated together, mostly do due the salt water electrolyte. Some metals require high currents and voltages in order to be plated and the water in the electrolyte starts to boil from the temperature and splits into hydrogen and oxygen from the current.New electrolytes without water can handle much more current and temperature so it is now possible to coat anything with any metal or metal oxide with how many layers you want. Basically metal composites."

"Really cool!"

"Neat! But I would like to see an aimbot implemented in the robotic hand/arm to control the bow so that the arrow always hit bulls eye."

"Oh! My brother found a very similar chair in the dumpster and took it home.It is surprisingly heavy so the wood must be real throughout.I actually think our chair is nicer, the arm rest looks like this one from above but have a wing/propeller profile shape to it."

"There is no way that adjustable angle thingy will survive.And would you not crush the pipe or flatten it when the half circle profile do not protect the pipe from the floor?"

"Magnetic eddy current brakes, such as those in roller coasters or freefall."

"I wouldn't worry about the belt, even if they are the cheapest polyester belts, they can take the load.I am more worried about the aluminum tabs which are riveted as a joint. The tabs will fail because aluminium will be fatigued each time it is slightly bent and ultimately snap."