Pensive

       How fast are you moving     If you put this simple question to different people, you would get different answers depending on where they are or what they are doing. " I am running at 20 km/h" " I am on my motorbike at 80Km/h" " My car odometer says I am at 120 Km/h" "Ladies & Gentlemen, this is your captain speaking, We are currently cruising at 800 Km/h at an altitude of 35000 feet." "Houston,  we don't have a problem ,  all ok up here in the International Space station & we are orbiting the Earth at 28000 km/h". Which is the top speed of our satellites. And if I put that to my friend watching TV with me in my living room, "Are you nuts? I am not moving, is your head spinning?" Interestingly each one of them is right & each one of them is wrong.  Speed is relative & always has a seemingly stationary reference point. If there is no reference point then you would not know if you are