What exactly is Big Data? This video defines and explains Big Data as well as Hadoop and MapReduce in simple language.
Rating Newest Oldest. Best Answer: Time is an illusion in that it's not a real, *natural* feature of the universe. Time is not absolute, meaning there's no Cosmic Master Clock that ticks off the correct time for the entire universe.
1 O 'clock is an abbreviation of of the clock.  In times past clocks were relatively rare. Most people told time by some reference to the position of the sun or moon. The times provided by these two bodies do not always concur with those provided by a clock. Hence there was a need to differentiate between the time provided of the clock (o'clock) and the time used by the vast majority of people in a given locality.