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1. Are all effects of relativity Viz. Time Dilation and Length Contraction real or apparent? And if some are real and others are apparent, which is the factor differentiating between them?

2. Does acceleration cause time dilation? For example, If one of the two twin clocks is accelerated to certain distance and brought back in perfectly symmetrical way, without any constant velocity period, will it accumulate less time?

3. Can two clocks, in uniform relative motion, be synchronized?

A