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2. RC time constant - Wikipedia

   en.wikipedia.org/wiki/RC_time_constant

   The RC time constant, denoted τ (lowercase tau), the time constant (in seconds) of a resistor–capacitor circuit (RC circuit), is equal to the product of the circuit resistance (in ohms) and the circuit capacitance (in farads):

3. Sunglasses - Wikipedia

   en.wikipedia.org/wiki/Sunglasses

   Oakley, for example, has straight resting hooks on all their glasses, preferring to call them "earstems". In recent years, manufacturers have started to use various types of woods to make frames for sunglasses. Materials such as bamboo, ebony, rosewood, pear wood, walnut and zebrawood, are used making them non-toxic and nearly allergy free. The ...

4. 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.

5. 97.5th percentile point - Wikipedia

   en.wikipedia.org/wiki/97.5th_percentile_point

   The approximate value of this number is 1.96, meaning that 95% of the area under a normal curve lies within approximately 1.96 standard deviations of the mean. Because of the central limit theorem, this number is used in the construction of approximate 95% confidence intervals. Its ubiquity is due to the arbitrary but common convention of using ...

6. Standard deviation - Wikipedia

   en.wikipedia.org/wiki/Standard_deviation

   An estimate of the standard deviation for N > 100 data taken to be approximately normal follows from the heuristic that 95% of the area under the normal curve lies roughly two standard deviations to either side of the mean, so that, with 95% probability the total range of values R represents four standard deviations so that s ≈ R/4.

7. Leprosy - Wikipedia

   en.wikipedia.org/wiki/Leprosy

   Common symptoms present in the different types of leprosy include a runny nose; dry scalp; eye problems; skin lesions; muscle weakness; reddish skin; smooth, shiny, diffuse thickening of facial skin, ear, and hand; loss of sensation in fingers and toes; thickening of peripheral nerves; a flat nose from destruction of nasal cartilages; and changes in phonation and other aspects of speech ...