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  2. Half-life - Wikipedia

    en.wikipedia.org/wiki/Half-life

    Half-life (symbol t) is the time required for a quantity (of substance) to reduce to half of its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay or how long stable atoms survive. The term is also used more generally to characterize any type of exponential (or, rarely ...

  3. Attention span - Wikipedia

    en.wikipedia.org/wiki/Attention_span

    Attention span. Attention span is the amount of time spent concentrating on a task before becoming distracted. [1] Distractibility occurs when attention is uncontrollably diverted to another activity or sensation. [2] Attention training is said to be part of education, particularly in the way students are trained to remain focused on a topic of ...

  4. Doubling time - Wikipedia

    en.wikipedia.org/wiki/Doubling_time

    For example, with an annual growth rate of 4.8% the doubling time is 14.78 years, and a doubling time of 10 years corresponds to a growth rate between 7% and 7.5% (actually about 7.18%). When applied to the constant growth in consumption of a resource, the total amount consumed in one doubling period equals the total amount consumed in all ...

  5. Business cycle - Wikipedia

    en.wikipedia.org/wiki/Business_cycle

    Business cycles are intervals of general expansion followed by recession in economic performance. The changes in economic activity that characterize business cycles have important implications for the welfare of the general population, government institutions, and private sector firms. There are many specific definitions of a business cycle.

  6. Collatz conjecture - Wikipedia

    en.wikipedia.org/wiki/Collatz_conjecture

    For instance, the first counterexample must be odd because f(2n) = n, smaller than 2n; and it must be 3 mod 4 because f 2 (4n + 1) = 3n + 1, smaller than 4n + 1. For each starting value a which is not a counterexample to the Collatz conjecture, there is a k for which such an inequality holds, so checking the Collatz conjecture for one starting ...

  7. Motivation - Wikipedia

    en.wikipedia.org/wiki/Motivation

    Motivation is an internal state that propels individuals to engage in goal -directed behavior. It is often understood as a force that explains why people or animals initiate, continue, or terminate a certain behavior at a particular time. It is a complex phenomenon and its precise definition is disputed.

  8. Deflation - Wikipedia

    en.wikipedia.org/wiki/Deflation

    In economics, deflation is a decrease in the general price level of goods and services. [ 1 ] Deflation occurs when the inflation rate falls below 0% (a negative inflation rate). Inflation reduces the value of currency over time, but deflation increases it. This allows more goods and services to be bought than before with the same amount of ...

  9. Menopause - Wikipedia

    en.wikipedia.org/wiki/Menopause

    Menopause, also known as the climacteric, is the time when menstrual periods permanently stop, marking the end of reproduction. [ 1 ][ 6 ] It typically occurs between the ages of 45 and 55, although the exact timing can vary. [ 7 ] Menopause is usually a natural change. [ 3 ]

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