Life in a Day (2011 film) part of the "elite" and to show the intricacy and strangeness of the seemingly mundane." Macdonald began his "Around the world in 80,000 clips" article in "The Guardian" by posing the questions, ""What do you love? What do you fear? What's in your pocket?"" and explaining that "one day last summer, I asked ordinary people around the world to answer those three questions and spend a day filming their lives." The 80,000 individual clips received amounted to 4,500 hours of electronic footage. Macdonald explained that about 75% of the film's content came from people contacted through YouTube, traditional advertising, TV
Life expectancy formula_2 is formula_19. Life expectancy is by definition an arithmetic mean. It can also be calculated by integrating the survival curve from 0 to positive infinity (or equivalently to the maximum lifespan, sometimes called 'omega'). For an extinct or completed cohort (all people born in year 1850, for example), it can of course simply be calculated by averaging the ages at death. For cohorts with some survivors, it is estimated by using mortality experience in recent years. The estimates are called period cohort life expectancies. It is important to note that the statistic is usually based on past mortality experience