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2. Factor of safety - Wikipedia

   en.wikipedia.org/wiki/Factor_of_safety

   In engineering, a factor of safety (FoS) or safety factor (SF) expresses how much stronger a system is than it needs to be for an intended load.Safety factors are often calculated using detailed analysis because comprehensive testing is impractical on many projects, such as bridges and buildings, but the structure's ability to carry a load must be determined to a reasonable accuracy.

3. Risk-free rate - Wikipedia

   en.wikipedia.org/wiki/Risk-free_rate

   The risk-free rate is also a required input in financial calculations, such as the Black–Scholes formula for pricing stock options and the Sharpe ratio. Note that some finance and economic theories assume that market participants can borrow at the risk-free rate; in practice, very few (if any) borrowers have access to finance at the risk free ...

4. Here's what Americans think they need to be considered wealthy

   www.aol.com/news/heres-americans-think...

   Americans believe it now takes an average net worth of $2.5 million to be counted as rich, a 14% increase from last year's $2.2 million, according to a new survey from Charles Schwab.

5. Standard error - Wikipedia

   en.wikipedia.org/wiki/Standard_error

   when the probability distribution of the value is known, it can be used to calculate an exact confidence interval; when the probability distribution is unknown, Chebyshev's or the Vysochanskiï–Petunin inequalities can be used to calculate a conservative confidence interval; and

6. Free surface - Wikipedia

   en.wikipedia.org/wiki/Free_surface

   Flatness refers to the shape of a liquid's free surface. On Earth, the flatness of a liquid is a function of the curvature of the planet, and from trigonometry, can be found to deviate from true flatness by approximately 19.6 nanometers over an area of 1 square meter, a deviation which is dominated by the effects of surface tension.

7. Exponential growth - Wikipedia

   en.wikipedia.org/wiki/Exponential_growth

   The amount of increase keeps increasing because it is proportional to the ever-increasing number of bacteria. Growth like this is observed in real-life activity or phenomena, such as the spread of virus infection, the growth of debt due to compound interest , and the spread of viral videos .

8. Pascal's calculator - Wikipedia

   en.wikipedia.org/wiki/Pascal's_calculator

   Pascal's calculator (also known as the arithmetic machine or Pascaline) is a mechanical calculator invented by Blaise Pascal in 1642. Pascal was led to develop a calculator by the laborious arithmetical calculations required by his father's work as the supervisor of taxes in Rouen . [ 2 ]

9. Free (Zac Brown Band song) - Wikipedia

   en.wikipedia.org/wiki/Free_(Zac_Brown_Band_song)

   "Free" is the fourth single from the band's debut album to reach Number One on the Hot Country Songs charts, having peaked on the chart dated for the week ending August 21, 2010. Its peak makes Zac Brown Band the first country music act to have four Number One singles from a debut album since Brooks & Dunn 's Brand New Man produced four Number ...