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How To: Parametrize a surface with two parameters

From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to parameterize a surface with two parameters.

How To: Find the position of a vector-valued function

From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to determine the position vector-valued function for parameterization.

How To: Calculate the United States unemployment rate

From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to calculate the US unemployment rate given the raw data.

How To: Solve radical equations with extraneous solutions

From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to work with radical equations containing invalid or "extraneous" solutions.

How To: Visualize data with a histogram chart

From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to create a simple histogram chart.

How To: Simplify rational radicals

From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just study for that next big test). With this free math lesson, you'll learn how to simplify rational radical expressions.

How To: Find the graph of a square root function

From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to sketch the graph a square root function.

How To: Make calculations with the Pythagorean theorem

From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to solve problems with the Pythagorean theorem in geometry.

How To: Chart data with a box and whisker plot

From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free statistics tutorials, you'll learn how to use visualize data by graphing it in a box-and-whisker diagram.

How To: Measure dispersion with range, variance & std dev

From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to use statistical range, variance and standard deviation to measure dispersion in a data set.

How To: Solve rational equations in algebra

From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to solve an equation in which to rational expressions are said to equal each other.

How To: Simplify rational expressions in algebra

From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just study for that next big test). With this two-part installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to simplify rational expressions in algebra.

How To: Take a child's measurements in pediatric nursing

Studying to be a pediatric nurse? Then here is a nursing how-to video that teaches you how to take a child's measurements. Every nurse should know the basics of this technique, follow along and see how easy it is to measure the head, chest, abdomen and length in cm. These medical tips are sure to help you pass your nursing exam with flying colors.

How To: Access a port-a-cath in nursing

Studying to be a nurse? Then here is a nursing how-to video that teaches you how to access por-a-caths on a patient. Every nurse should know the basics of this technique, follow along and see how easy it is to identify and access port-a-caths on your patient so that they can receive their medication properly. These medical tips are sure to help you pass your nursing exam with flying colors.

How To: Change the dressing on a stage two wound in nursing

Studying to be a nurse? Then here is a nursing how-to video that teaches you how to change the dressing on a stage II wound. Every nurse should know the basics of this technique, follow along and see how easy it is to use wound care products to change the dressing on a stage II wound. These medical tips are sure to help you pass your nursing exam with flying colors.

How To: The Simple Way to Stop Your iPhone from Sending Unwanted Audio Messages

Your iPhone's audio messages may get you in trouble if they haven't done so already. It's way too easy for your iPhone to start recording without your knowledge, only to send a friend or family member a conversation you're having about them. (Awkward.) Luckily, protecting yourself takes only the flick of a switch.

Coming Soon: Share Instagram Comments in Direct Messages, Stories, or Other Apps

Sometimes, you'll see a comment on Instagram that you really need to share. Maybe it's something funny, possibly offensive. Whatever the case, the only thing to do is screenshot it and share that, right? Hopefully, not for long. Instagram is currently testing a feature that would allow you to share comments with others via a direct message and maybe even to stories and other apps.

How To: HTML Web Design Tutorials for HTML Heading Tags H1 to H6 Lesson 3

This HTML Web Design tutorial will explain how to add a Heading tag for your website. The heading tag is very important because it helps search engines to determine what the main topic is on a particular web page within your website. The HTML codes for heading tags range from h1 to h6 with h1 being the most important or in other words the main heading HTML web design tag. Make sure to give the h1 tag the most importance in terms of titles on your web page for headings. Another rule I recommen...

How To: View Your Friend's Tweets in the Contacts App on Mac OS X Mountain Lion

A hidden feature residing in Mac OS X Mountain Lion is the ability to view and also reply to your friend's tweets through the Contacts application, previously known as Address Book. The only way to do this, though, is to provide your Twitter account login data to the Contacts app. To integrate your Twitter, just go to System Preferences, then click on Mail, Contacts & Calendars and choose Twitter. Put in your Twitter login information and then click on Update Contacts. Twitter will use your e...