Bernie B, Neville J From Bernie Brauer Thu Jul 19 16:36:27 2007 I actually tried that exact experiment on a bullet train and suceeded in cathing the ball. It was on a Transrapid Maglev Train in Shanghai and I was on my way back to the airport with the train going at a velocity of well over 200 miles per hour. From Neville Jones Fri Jul 20 12:15:58 2007 No need for a vacuum; just strap a Pope-mobile canopy on top of the car. The ball would follow a parabolic path, just as it does in the railway carriage, and come back down through the sunroof to be caught by our antipodean cousin. Can I take you both at your word then, when you assert that a ball thrown vertically will return to your hands regardless of the velocity of whatever you are sitting/standing on providing only that the air is also moving with whatever you are sitting/standing on? Paul D Yahoo!7 Mail has just got even bigger and better with unlimited storage on all webmail accounts. http://au.docs.yahoo.com/mail/unlimitedstorage.html