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The objectives for this lesson are that by the end of the week you will be able to:

• LOxt00: describe the notion of space-time and of events.
• LOxt01: contrast motion in different reference frame (point of view).
• LOxt02 describe the basic postulate of Einstein’s theory of special relativity
• LOxt03: describe the special nature of the speed of the light.
• LOxt04: describe time dilation
• LOxt05: use E =mc^{2} to convert mass and energy.