effective, average, marginal. -The effective tax rate is the best measure of the tax burden because it is the average level of tax on all income from taxable and nontaxable sources. -The average tax rate measures the average level of tax on only taxable income.
Navigating the eschaton. The eschaton is something to be avoided and something to be courted. It is a virtual singularity of human consciousness marking the end of the historical epoch. In itself it is a neutral event, one to be reckoned with. It is a point of leverage for wielding the human spirit.
A CAPTCHA (a backronym for Completely Automated Public Turing test to tell Computers and Humans Apart) is a type of challenge-response test used in computing to determine whether or not the user is human. The term was coined in 2003 by Luis von Ahn, Manuel Blum, Nicholas J. Hopper, and John Langford.