Sony Outlets Control Electricity Through Authentication
MacBook's "Unremovable" Battery Easy To Remove
BTW, a lot of those easily stripped "Phillips" screws are actually JIS screws. They look similar but the angle of the point is different. A Phillips driver doesn't quite make enough contact and will just core the head right out if there is any resistance.
Matter Discovered Traveling at Near Light Speed
I asked this question in a physics class and the answer I got, which makes quite a bit of sense, is that force travels through a material at the speed of sound. So if in your example your 500 foot pole was made of steel, the opposite end starts moving roughly 30 milliseconds after you push the near end. (The speed of sound in steel is very roughly 5000 meters/sec.)