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  2. Timeline of the evolutionary history of life - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_the...

    More than 99 percent of all species that ever lived (over five billion) [1] are estimated to be extinct. [2] [3] Estimates on the number of Earth's current species range from 10 million to 14 million, [4] with about 1.2 million or 14% documented, the rest not yet described. [5]

  3. History of Earth - Wikipedia

    en.wikipedia.org/wiki/History_of_Earth

    It is estimated that 99 percent of all species that ever lived on Earth, over five billion, [16] have gone extinct. [17] [18] Estimates on the number of Earth's current species range from 10 million to 14 million, [19] of which about 1.2 million are documented, but over 86 percent have not been described. [20]

  4. Direct labour cost variance - Wikipedia

    en.wikipedia.org/wiki/Direct_labour_cost_variance

    The actual cost of this labor time was $64,800, or an average of $14.40 per hour. The company produced 2000 units of product A during the month. The labor efficiency variance is (4500 - 5000) x $14 = $7000, where 5000 hours = 2.5 hours x 2000 units of output. This variance is favorable since the actual hours used are less than the standard ...

  5. 68–95–99.7 rule - Wikipedia

    en.wikipedia.org/wiki/68–95–99.7_rule

    In statistics, the 68–95–99.7 rule, also known as the empirical rule, and sometimes abbreviated 3sr, is a shorthand used to remember the percentage of values that lie within an interval estimate in a normal distribution: approximately 68%, 95%, and 99.7% of the values lie within one, two, and three standard deviations of the mean, respectively.

  6. Tax bracket - Wikipedia

    en.wikipedia.org/wiki/Tax_bracket

    The 10% rate applies to income from $1 to $10,000; the 20% rate applies to income from $10,001 to $20,000; and the 30% rate applies to all income above $20,000. Under this system, someone earning $10,000 is taxed at 10%, paying a total of $1,000. Someone earning $5,000 pays $500, and so on. Meanwhile, someone who earns $25,000 faces a more ...

  7. 2020 United States presidential election - Wikipedia

    en.wikipedia.org/wiki/2020_United_States...

    [303] [note 1] [304] In 2020, 58 percent of U.S. voters lived in landslide counties, [305] a decline from 61 percent in 2016. [306] Trump became the 11th incumbent in the country's history, and the first since 1992, to lose a bid for a second term. Biden's 51.3% of the popular vote was the highest for a challenger to an incumbent president ...

  8. 30-year-old commutes 4 hours to work every day to avoid ...

    www.aol.com/news/30-old-commutes-4-hours...

    The cost of living in San Francisco is more than 62 percent higher than the national average, data shows. 30-year-old commutes 4 hours to work every day to avoid $4,500-a-month San Francisco rent ...

  9. High availability - Wikipedia

    en.wikipedia.org/wiki/High_availability

    High availability (HA) is a characteristic of a system that aims to ensure an agreed level of operational performance, usually uptime, for a higher than normal period. [1] There is now more dependence on these systems as a result of modernization. For instance, in order to carry out their regular daily tasks, hospitals and data centers need ...