Implying I wont step into LHC wearing space suit and wont accidentally the whole earth...













I'm sure if that is the case I shall be very quickly corrected as is usually the case around here! 






















I think because an elevator is not usually in freefall there is enough upthrust on the elevator to allow you to jump? If it were in freefall surely you would not be able to jump because it is travelling downwards faster than you are able to jump upwards? I see where the car example is useless because gravity is the force taking you downwards in the elevator while the elevator walls just encase you. When travelling in a car you're being accelerated along with it. Like I said, not so good with physics. Only science I am ok at is biology! :nerd: 


