2fa
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2fa
Its a two factors authetication machanism to verify the user identity. Two factors involed are something you have (e.g. a physical bank card) and something you know (e.g. you password).
Multi-factor authentication (also Two-factor authentication, TFA, T-FA or 2FA) is an approach to authentication which requires the presentation of two or more of the three authentication factors: a knowledge factor.
requured
Read page 52 of this PDF document:http://www.google.com/url?sa=t&source=web&ct=res&cd=1&ved=0CAwQFjAA&url=http%3A%2F%2Fec1.images-amazon.com%2Fmedia%2Fi3d%2F01%2FA%2Fman-migrate%2FMANUAL000029660.pdf&ei=CgknS7m0LNGEnQfJsJCcDQ&usg=AFQjCNG6DLZctXYF45mP3BJC55qQtf-Rhw&sig2=cQ2R7XayA07FAKuKMwf8Rg
They got their education by secretly learning it if their master didn't allowed because it was illegal. Sometimes, their masters tought the slave even though it was against the law. By secretly learning it, they could learn it off another slave or steal a book and educate themselves.
they just work they just work,work,work
the work a machine does is the work outputwhat it takes to do the work is the work inputSources;The_work_that_the_simple_machine_does_is_called_the_work
the work a machine does is the work output what it takes to do the work is the work input
Work , Work , Work , Work , Work , Work ! They do what You lazy Americans don't . Mexicans work hard . They do it all !