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ical and chemical condition in which it moves.

It is comprehensible that a person could not have arrived at such afar-reaching change of view by continuing to follow the old beatenpaths, but only by introducing some sort of new idea. Indeed,Einstein arrived at his theory through a train of thought of greatoriginality. Let me try to restate it in concise terms.

THE EARTH AS A MOVING CAR

Everyone knows that a person may be sitting in any kind of a vehiclewithout noticing its progress, so long as the movement does not varyin direction or speed; in a car of a fast express train objects fallin just the same way as in a coach that is standing still. Only whenwe look at objects outside the train, or when the air can enter thecar, do we notice indications of the motion. We may compare the earthwith such a moving vehicle, which in its course around the sun hasa remarkable speed, of which the direction and velocity during aconsiderable period of time may be regarded as constant. In placeof the a

ical and chemical condition in which it moves.

It is comprehensible that a person could not have arrived at such afar-reaching change of view by continuing to follow the old beatenpaths, but only by introducing some sort of new idea. Indeed,Einstein arrived at his theory through a train of thought of greatoriginality. Let me try to restate it in concise terms.

THE EARTH AS A MOVING CAR

Everyone knows that a person may be sitting in any kind of a vehiclewithout noticing its progress, so long as the movement does not varyin direction or speed; in a car of a fast express train objects fallin just the same way as in a coach that is standing still. Only whenwe look at objects outside the train, or when the air can enter thecar, do we notice indications of the motion. We may compare the earthwith such a moving vehicle, which in its course around the sun hasa remarkable speed, of which the direction and velocity during aconsiderable period of time may be regarded as constant. In placeof the a