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2. Add or disable 2-step verification for extra security - AOL Help

   help.aol.com/articles/2-step-verification...

   Enable 2-step for phone. 1. Sign in to your Account Security page. 2. Next to "2-Step Verification," click Turn on. 3. Select Phone number for your 2-step verification method. 4. Follow the on-screen prompts to complete the process. Sign in with 2-step for phone. 1. Sign in to your AOL account with your password. 2. Enter the verification code ...

3. Non-random two-liquid model - Wikipedia

   en.wikipedia.org/wiki/Non-random_two-liquid_model

   VLE of the mixture of chloroform and methanol plus NRTL fit and extrapolation to different pressures. The non-random two-liquid model [1] (abbreviated NRTL model) is an activity coefficient model introduced by Renon and Prausnitz in 1968 that correlates the activity coefficients of a compound with its mole fractions in the liquid phase concerned.

4. Aztec Two-Step - Wikipedia

   en.wikipedia.org/wiki/Aztec_Two-Step

   Aztec Two-Step is an American folk-rock band, formed by Rex Fowler and Neal Shulman at a chance meeting on open stage, at a Boston coffee house, the Stone Phoenix, [1] in 1971.

5. Generalized estimating equation - Wikipedia

   en.wikipedia.org/wiki/Generalized_estimating...

   The likelihood ratio test is not valid in this setting because the estimating equations are not necessarily likelihood equations. Model selection can be performed with the GEE equivalent of the Akaike Information Criterion (AIC), the quasi-likelihood under the independence model criterion (QIC).

6. Empirical formula - Wikipedia

   en.wikipedia.org/wiki/Empirical_formula

   Glucose (C 6 H 12 O 6), ribose (C 5 H 10 O 5), Acetic acid (C 2 H 4 O 2), and formaldehyde (CH 2 O) all have different molecular formulas but the same empirical formula: CH 2 O.This is the actual molecular formula for formaldehyde, but acetic acid has double the number of atoms, ribose has five times the number of atoms, and glucose has six times the number of atoms.

7. Chemistry - Wikipedia

   en.wikipedia.org/wiki/Chemistry

   Chemistry is the scientific study of the properties and behavior of matter. [1] It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances.