If you already have a tendency to lean forward when walking up a flight of stairs, you're likely going to have the same poor posture and form on the stair-climber, and hunching over the handrails isn't doing your body any favors. It limits the amount of bodyweight you have to use/l...
Magnetism has another very important use. Suppose you need to leave a message for a friend and all you have is a magnet and an unmagnetized iron nail. Suppose the message is a very simple one: either you will see your friend later that day or not. You could arrange with your friend ...
Arduinos have little “power regulators” that take power up to 12v and bring it down to 5v so the Arduino can use it without getting crispy. You can tap into that 5v power line to use for the things that require more power than the output pins provide – but if the things you conne...