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How To: Solve word problems that involve rounding to estimate differences

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 unpack and solve problems that require you to estimate differences by rounding.

How To: Solve math problems involving the identity property of one

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 unpack and solve word problems requiring use of the identity property of 1.

How To: Prepare your kids for their first camping trip

In this clip, learn how to get your children ready for a camping trip. Camping can be a fantastic experience for your little ones where they can learn about the environment, animals and basic outdoor activities. Teach your kids outdoor safety and get them involved so that they have a ton of fun.

How To: Get through airport security quickly

Airport security lines are one of the biggest hassles involved in air travel. Navigating them quickly and successfully can be the difference between making your flight and not. This video offers some tips for how to get through security quickly, including buying airport-security-friendly luggage and packing said luggage in an easy-to-inspect way. Also, don't wrap any gift, as security may want to unwrap them!

How To: Perform a Superman air on a surfboard

In this clip, Jordy Smith teaches you how to perform a Superman air move on your surfboard for maximum impact. The Superman is a complicated looking move that involves grabbing your board mid-air and landing back down on it. Jordy gives great advice for which type of waves to seek out and how to maintain your balance on the water.

How To: Perform the rodeo flip on a surfboard

In this video from Surfline, Jamie O'Brien shows you how to perform an awesome rodeo flip on a surfboard while you are in the ocean. Rodeo flips involve flipping upside down and landing back on your feet. This trick is pretty awesome and you will get some expert advice from this tutorial to get you started.

How To: Solve rate-of-change business math problems in Excel

As you might guess, one of the domains in which Microsoft Excel really excels is business math. Brush up on the stuff for your next or current job with this how-to. In this tutorial from everyone's favorite digital spreadsheet guru, YouTube's ExcelIsFun, the 30th installment in his "Excel Business Math" series of free video lessons, you'll learn how to solve business math word problems that involve rate of change (increase or decrease).

How To: Build arm strength for pitching

In this how to video, you will learn how to build up your arm strength for pitching. This involves using exercises that give you more focus on the muscles you will use for throwing. A high cable curl and crunch is a useful exercise for doing this. It involves gripping the rope on a weight machine and combining two different exercises together as one. You first start out with a curl, and then move on to a crunch. Repeat this for as many times as necessary. This will help you get a little extra...

How To: Get System Restore to use less disk space in Windows 7

In this video tutorial, viewers learn how to make the System Restore feature use less space in Windows 7. Begin by clicking on the Start menu. Right-click on Computer and select Properties. Under Tasks, click on System protection. In the System Properties window, select the hard drive and click Configure. Under Disk Space Usage, drag the slider to the left for a lower amount. Then click on Apply and OK to confirm. This video will benefit those viewers who have a Windows 7 computer and would l...

How To: Dance the Harlem Shake

Dance the Harlem Shake with help from this free dance lesson taught by two experts! The Harlem shake is a dance move that involves pivoting the shoulder out while bringing the other shoulder out at the same time.

How To: Use the double space function in MS Word 07

Here you will learn how to use the double space function in MS Word 07. To use the double space function in MS Word, do the following: Open MS Word 07. After typing in some text, highlight the part which you want to double space. Click on the Icon that says "Line Spacing". Click on it and scroll down to find 2.0. Click on it. Now your work has been double spaced. A shortcut to do this would be to click Control and 2, and it will automatically double space everything for you.

How To: Make the perfect egg omelette

Jack from "Cooking with Jack" shows you how to make the perfect omelette in this quick video. You'll learn the common problems and mistakes made when making an omelette and how to make some simple corrections. He discusses the wide variety of ingredients that you can use. Jack then shows you a new method that a viewer sent in that involves broiling the omelette in the oven to ensure you end up with a perfectly cooked omelette every time!

How To: Do a slant gainer/cheat gainer

In this video tutorial the performer demonstrates the slant gainer, also known as the cheat gainer. Basically, it involves hurling yourself away from the ground, spinning in the air for a while and then trying to land without busting your ankles and/or head. If accomplished successfully, it looks extremely cool. If it ends in failure, at least you might get a hit YouTube clip out of it.

How To: Spring bump locks

This is a great spring bumping demo from UK Bump Keys. Spring bumping involves inserting a spring over a bump key to disledge the mechanisms in a lock. This is a locksmith and lockpick demonstration.

How To: Do an Elmsley count card trick

Learn to do an Elmsley count card trick. With this video tutorial, you'll better your skills as a magician, and learn the proper techniques and presentation involved when performing an Elmsley count magic card trick. This is a great addition to your sleight of hand repertoire. Made by Richard Scorpio.

How To: Windmill in break dance

This is a video guide on how to do windmills in break dance. He's doing a counter-clockwise version. This is very difficult and involves balancing on your hand while twirling around. You must support your whole body weight with one arm. It is good to practice this breakdancing move on carpet so you don't smash your face up.

How To: Meditate to relax with Tara Stiles

Here are some meditation tips from Tara Stiles. Tara Stiles is a revered Ford Models yoga instructor. Meditation is a mental discipline by which one attempts to get beyond the conditioned, "thinking" mind into a deeper state of relaxation or awareness. Meditation often involves turning attention to a single point of reference. It is recognized as a component of almost all religions, and has been practiced for over 5,000 years.

How To: Properly cross a stream in trekking or hiking

A short how to video on how to perform a safe stream crossing or ford using trekking poles when ultralight backpacking. Hiking or trail running often involves crossing or fording rivers and streams. Make sure you cross the water properly so that you don't get caught in a current or injured on rocks.

How To: Hold a lacrosse stick properly

Check out this instructional lacrosse video that demonstrates how to hold a lacrosse stick. Holding a lacrosse stick correctly involves adjusting the hands for catching, cradling and passing. Learn how to hold a lacrosse stick in this video.

How To: Create exploding water

Watch this instructional science video to learn how to create hydrogen from water, salt and electricity, for only a few dollars. This is an experiment that produces explosive gases, involves electricity and water and a number of risks so please be careful. Not an experiment to be performed by idiots. Create exploding water with this educational tutorial.

How To: Create an iMac in Photoshop

This Adobe Photoshop tutorial shows you how to create an iMac in Photoshop. Now, there's no magic involved so you won't be able to use the iMac you create as a computer, but if you need an image of an iMac, you will learn how to create one yourself using Photoshop.

How To: Levitate

After a silly opening with some amazing levitation we learn how to do a much simpler levitation. This video is hilarious and you can learn a thing or two from it. This is not the Balducci levitation. It is an ingenious bootleg solution that involves taking off one shoe, and a blanket that disguises some of the method.