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How To: Solve quadratic inequalities in calculus

Calculus can be a bit tricky, but don't worry, Watch Math is here to help you out. Watch this math video lesson to learn how to solve quadratic inequalities in calculus. There's no better way to learn mathematics than from an advanced mathematician, like this PhD.

How To: Play the card game Sixteen

The multiple award-winning card game Sixteen is packed with head-to-head action. If you can you count to 16 and take calculated risks, then you can force your opponent to bust. But play your cards defensively at the right time or the tables will turn! Win the most sets and you'll win the game. It sounds simple (and it is), but Sixteen's unique strategy and cribbage-like counting will hold the attention of even the most seasoned game players.

How To: Make bio diesel

Make your own backyard biodiesel with the help of Kipkay. It's easy to make a small batch that will work in any diesel engine. You won't need any special equipment--an old juice bottle will serve as the "reactor" vessel--and on such a small scale, you can quickly refine your technique and perform further experiments. Thanks go to Rob Elam for the original article in Make Volume 3To download Making Biodiesel MP4 click here or subscribe in iTunes. Check out the complete Making Biodiesel article...

How To: Mix the Singapore Sling

Mixologist Chris McMillian walks us through the history and creation of the Singapore Sling in this instructional video. The drink originated in a hotel in Singapore--the drink used to be a Collins with a splash of cherry herring. This recipe is the original recipe from Raffles Hotel, where the drink was first made.

How To: Tie the 'Windsor' knot

The Windsor knot, also (wrongly) known as the "Double-Windsor" (a non-existent enormous 16-move knot), is the most well known knot in the world. The Windsor is a large, symmetrical, self-releasing triangular knot. The tie was named by Americans in the 1920-30's after the Duke of Windsor. The Duke was known for his fondness of large triangular tie knots, but didn't in fact invent this particular knot. His secret was a specially tailored tie with an extra thickness of material.

How To: Make the Glock full auto on Counter Strike: Source

Counter Strike: Source is one of those PC games that is literally never going to go away. This video will help to increase that already-prodigious longevity by teaching you how to use a glitch to make the Glock handgun in the game fully automatic. This turns it from a pretty useless handgun into a destructive force on the map. Quick, easy, and fun.

How To: Get Installous on a jailbroken iPhone or iPod Touch

Worlds Playground shows you how to install Installous on a jail broken iPhone or iPod Touch. You must have an iPhone or an iPod Touch first or second generation. Your first step is to open your Cydia app. Go to the manage tab of the app and then click on the sources button. The next step is to go to edit and then add. The source you need to add is "http:/cydia.hackulo.us/". After adding that source go to changes and download the MI patch. Once that is done go back to Cydia and changes and cli...

How To: Change preference values in Bejeweled 2 (12/02/08)

Bejeweled 2 is a famous web-based free game. Bejewel 2 Deluxe is not free and is available for PC, Xbox 360, Apple's iPod and iPhone, PlayStation 2, smartphones, and Macs. Learn how to hack Bejeweled with tricks, cheats, hacks. This video tutorial will show you how to change preference values in Bejeweled 2 to get very high scores, making a boring game even more boring!

How To: Map text files with MapForce

MapForce supports flat files as the source and/or target of any mapping involving XML, database, EDI, web services or other flat file data. In this how-to, you'll find instructions for mapping data from arbitrary text files (such as log files, CSV, fixed-width, and other legacy data sources) to databases and XML files.

News: If You Can't Open Your iPhone's Photos on a PC, Try This App

Apple's codec for photos and videos in iOS 11, HEVC (High-Efficiency Video Coding), as well as the container, HEIF (High-Efficiency Image File Format), result in a reduction in size for pictures and movies without sacrificing quality. Seems like a win-win situation, but Windows-users can't open the .heic extension that these files use. In order to open HEIC files on a Microsoft Windows PC, you'll have to turn to third-party apps and tools. One of these tools, CopyTrans HEIC for Windows, essen...

How To: Change Your Android TV's Screensaver

Much like the Chromecast, Android TV devices such as the Nexus Player and Nvidia Shield TV have always had those beautiful background images as their default screensaver. However, unlike the Chromecast, these "Backdrop" images, as they're called, weren't always customizable on Android TV.

Sorting (Part 3.0): Insertion Sort

Note: a bug was found in the Insertion Sort implementations. The bug was corrected in each language. Please refer to the pastebin links for the most up-to-date versions of the sample code. Any screenshots may be behind. More about the bug can be found here.

News: A DreamWorks Tablet Is Coming. What's Next, HBO GO Phones?

If I could think of one thing the world was missing, it would surely be more tablets. While people struggle between shelling out 200 to 500 dollars for a new iPad, Nexus 7, Kindle Fire, Microsoft Surface, or one of the hundred other tablets on the market, the folks over at DreamWorks have decided to make their own, aptly named the Dreamtab. The Dreamtab will have an 8-inch screen and favor applications with the use of a stylus, for coloring and the like. Total cost is rumored to be under 300 ...

How To: Install Multi-View on Your Samsung Galaxy S3 to Run Multiple Apps at the Same Time

While many of the U.S. carriers have updated their Samsung Galaxy S3 devices to Android 4.1.2 already, one major absence from the upgrade is Samsung's Premium Suite. One of the coolest features from the Premium Suite is Multi-View, a function that lets you truly multitask by running two apps at the very same time—right next to each other. As you can see above in the left image, I have both Pandora and Spotify running. Why? Because why not?!? On the right, I have YouTube on top and Maps on the...

How To: Memory Full? Optimize the Photos on Your Samsung Galaxy S3 to Free Up Storage Space

While the increasing superiority of smartphone cameras is great, they can be a double-edged sword. Sure, we get great images that are crystal clear, but at what price? Storage space on your devices ends up paying the price for this luxury, filling up quickly due to the high-quality images and their grotesquely large size. Not only that, but most photo editing applications only make it worse. Adding a few filters, changing the hue/saturation, or adding some text across the picture can all incr...