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  2. Micro Four Thirds system - Wikipedia

    en.wikipedia.org/wiki/Micro_Four_Thirds_system

    Adapted lenses retain their native focal lengths but field of view is reduced by half —i.e., an adapted 50mm lens is still a 50mm lens in terms of focal length but has a narrower FOV equivalent to a 100mm lens due to the Micro Four Thirds System 2x crop factor. Therefore, most adapted glass from the 35mm film era and current DSLR lineups ...

  3. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    Graph of number of coupons, n vs the expected number of trials (i.e., time) needed to collect them all, E (T ) In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests.

  4. Bipolar disorder - Wikipedia

    en.wikipedia.org/wiki/Bipolar_disorder

    During periods of depression, the individual may experience crying and have a negative outlook on life and poor eye contact with others. [4] The risk of suicide is high; over a period of 20 years, 6% of those with bipolar disorder died by suicide, while 30–40% engaged in self-harm. [4]

  5. 2020 stock market crash - Wikipedia

    en.wikipedia.org/wiki/2020_stock_market_crash

    The Federal Reserve has expanded its balance sheet greatly through three quantitative easing periods since the financial crisis of 2007–2008.In September 2019, a spike in the overnight repo market interest rate caused the Federal Reserve to introduce a fourth round of quantitative easing; the balance sheet would expand parabolically following the stock market crash.

  6. YouTube - Wikipedia

    en.wikipedia.org/wiki/YouTube

    YouTube is an American online video sharing platform owned by Google.Accessible worldwide, [note 1] YouTube was launched on February 14, 2005, by Steve Chen, Chad Hurley, and Jawed Karim, three former employees of PayPal.

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