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SLAVERY. Texas was the last frontier of slavery in the United States. In fewer than fifty years, from 1821 to 1865, the "Peculiar Institution," as Southerners called it, spread over the eastern two-fifths of the state. The rate of growth accelerated rapidly during the 1840s and 1850s. The rich soil of Texas held much of the future of slavery, and Texans knew it. James S. Mayfield undoubtedly spoke for many when he told the Constitutional Convention of 1845 that "the true policy and prosperity of this country depend upon the maintenance" of slavery. Slavery as an institution of significance in Texas began in Stephen F. Austin's colony. The original empresario commission given Moses Austin by Spanish authorities in 1821 did not mention slaves, but when Stephen Austin was recognized as heir to his father's contract later that year, it was agreed that settlers could receive eighty acres of land for each bondsman brought to Texas. Enough of Austin's original 300 families brought slaves with them that a census of his colony in 1825 showed 443 in a total population of 1,800. The independence of Mexico cast doubt on the future of the institution in Texas. From 1821 until 1836 both the national government in Mexico City and the state government of Coahuila and Texas threatened to restrict or destroy black servitude. Neither government adopted any consistent or effective policy to prevent slavery in Texas; nevertheless, their threats worried slaveholders and possibly retarded the immigration of planters from the Old South. In 1836 Texas had an estimated population of 38,470, only 5,000 of whom were slaves.

SLAVERY . Texas was the last frontier of slavery in the United States. In fewer than fifty years, from 1821 to 1865, the "Peculiar Institution," as Southerners called it, spread over the eastern two-fifths of the state. The rate of growth accelerated rapidly during the 1840s and 1850s. The rich soil of Texas held much of the future of slavery, and Texans knew it. James S. Mayfield undoubtedly spoke for many when he told the Constitutional Convention of 1845 that "the true policy and prosperity of this country depend upon the maintenance" of slavery. Slavery as an institution of significance in Texas began in Stephen F. Austin 's colony. The original empresario commission given Moses Austin by Spanish authorities in 1821 did not mention slaves, but when Stephen Austin was recognized as heir to his father's contract later that year, it was agreed that settlers could receive eighty acres of land for each bondsman brought to Texas. Enough of Austin's original 300 families brought slaves with them that a census of his colony in 1825 showed 443 in a total population of 1,800. The independence of Mexico cast doubt on the future of the institution in Texas. From 1821 until 1836 both the national government in Mexico City and the state government of Coahuila and Texas threatened to restrict or destroy black servitude. Neither government adopted any consistent or effective policy to prevent slavery in Texas; nevertheless, their threats worried slaveholders and possibly retarded the immigration of planters from the Old South. In 1836 Texas had an estimated population of 38,470, only 5,000 of whom were slaves

States. In fewer than fifty years, from 1821 to 1865, the "Peculiar Institution," as Southerners called it, spread over the eastern two-fifths of the state. The rate of growth accelerated rapidly during the 1840s and 1850s. The rich soil of Texas held much of the future of slavery, and Texans knew it. James S. Mayfield undoubtedly spoke for many when he told the Constitutional Convention of 1845 that "the true policy and prosperity of this country depend upon the maintenance" of slavery. Slavery as an institution of significance in Texas began in Stephen F. Austin 's colony

Let’s start with what Khan Academy is. Khan Academy is a collection of video lectures that give demonstrations of mechanical processes. When it comes to this purpose, KA videos are, on the average, pretty good. Sal Khan is the main reason; he is approachable and has a knack for making mechanical processes seem understandable. Of course, his videos are not perfect. He tends to ramble a lot and get sidetracked; he doesn’t use visuals as effectively as he could; he’s often sloppy and sometimes downright wrong with his math; and he sometimes omits topics from his subjects that really need to be there (LU decomposition in linear algebra, for example). But on balance, KA is a great resource for the niche in which it was designed to work: giving demonstrations of mechanical processes.

But let’s also be honest about what Khan Academy is not. Khan Academy is not a substitute for an actual course of study in mathematics. It is not a substitute for a live teacher. And it is not a coherent curriculum of study that engages students at all the cognitive levels at which they need to be engaged. It’s OK that it’s not these things. We don’t walk into a Mexican restaurant and fault it for not serving spaghetti. I don’t fault Khan Academy for not being a complete educational resource, because it wasn’t designed for that purpose. Again, Khan Academy is a great resource for the niche in which it was designed to work. But when you try to extend it out of that niche — as Bill Gates and others would very much like to do — all kinds of things go wrong.

When we say that someone has “learned” a subject, we typically mean that they have shown evidence of mastery not only of basic cognitive processes like factual recall and working mechanical exercises but also higher-level tasks like applying concepts to new problems and judging between two equivalent concepts. A student learning calculus, for instance, needs to demonstrate that s/he can do things like take derivatives of polynomials and use the Chain Rule. But if this is all they can demonstrate, then it’s stretching it to say that the student has “learned calculus”, because calculus is a lot more than just executing mechanical processes correctly and quickly. To say that it is not — that knowledge of calculus consists in the ability to perform algorithmic processes quickly and accurately — is to adopt an impoverished definition of the subject that renders a great intellectual pursuit into a collection of party tricks.

Education is not the transmission of information or ideas. Education is the training needed to make use of information and idea

We provide individualized instruction in how to evaluate and make use of information and ideas, teaching people how to think for themselves.

A set of podcasts is the 21st-century equivalent of a textbook, not the 21st-century equivalent of a teacher