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Classic Chemistry: Colorize Colorless Liquids with "Black" Magic, AKA the Iodine Clock Reaction

Want to make boring old colorless water brighten up on command? Well, you can control the color of water with this little magic trick. Actually, it's not really magic, but a classic science experiment known commonly as the iodine clock reaction, which uses the reactions between water and chemicals to instantly colorize water, seemingly by command. You can use different colorless chemicals to produce different colors, and you can even make the color vanish to make the water clear again.

How To: Clean your car windows so they are streak free

In this Autos, Motorcycles & Planes video tutorial you are going to learn how to clean your car windows so they are streak free. You will need ammonia solution and a mixing bottle. Mix one part ammonia with ten parts of water in the mixing bottle. Make sure you take sufficient quantity of ammonia. Then get a spray bottle and pour the solution into it. Get a piece of rag and a micro fiber towel. Spray the window liberally with the solution and wipe with the rag. Now wipe with the micro fiber t...

How To: Make neat "hot ice"

In this video tutorial, viewers learn how to make "hot ice". Begin by adding water into a pan and heat it until it’s simmering, but not boiling. Add the sodium acetate to the water. Keep adding the sodium acetate until the water cannot dissolve it anymore. Stir constantly. Now pour the solution into a glass or container. Do not pour in any undissolved crystals. Place the solution into the refrigerator for 45 minutes. Now pour the solution into a container. The liquid will instantly turn into ...

How To: Use liver of sulfur solution to create a patina

artjewelrymag teaches you how to use a liver of sulfur solution to create a patina. First, be sure to wear protective gloves and eye gear. Be sure to perform this operation in a well-ventilated area because sulfur smells like rotten eggs. To get started, add a few small pieces of liver of sulfur to a small dish of warm water. Use a wooden stick or a small PVC pipe and stir. The temperature and the amount of time you leave the metal in the solution will affect the patina. You can dip the metal...

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: Watermark photos in Lightroom 2

Get your dose of the coolest Adobe Lightroom tutorials, tips, time-saving shortcuts, photographic inspiration, and undocumented tricks with Matt Kloskowski from Photoshop User TV. Photoshop Lightroom is the leading photo management software solution. See what leading photographers use to manage their photos, and how.

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: Use differential equations to solve for velocity

The guy first gives the definition of differential equations. He explains that a differential equation is an equation that contains the derivatives of an unknown function. He then gives some examples of differential equation and explains what the equation's order means. After that he gives an example on how to solve a simple equation. He calculates it and gives examples of graphs. Then he explains what a general solution is and how to narrow down the number of solutions using data from the pr...

How To: Make sodium bromate & potassium meta-periodate

This video tutorial is in the Education category which will show you how to make sodium bromate and potassium meta-periodate. This experiment uses toxic chemicals and releases harmful gases. First you have to make a saturated sodium bromide. To this solution then add a small amount of potassium dichromate. The solution now becomes concentrated. Then make the circuit as shown in the video. You need a 3 - 5 ohm resistor in order to reduce the current. Then let the cell run for around 6 hours. S...

How To: Use ninhydrin to reveal latent prints on paper

In this tutorial, we learn how to use ninhydrin to reveal latent prints on paper. This will work out because you will be spraying a special liquid onto the porous area. After this, you will turn on a black light and then be able to see the fingerprints appear in purple! Be careful with the solution, because it's flammable! This will also stain your skin, so make sure you wear gloves and don't let it contact a surface you don't want stained. To mix the solution, you will combine both of the so...

How To: Clean your coffee maker

Maria Cleaveland shows us how to clean a coffee maker in this tutorial. It's important to clean out your coffee maker because calcium and lime can build up throughout regular use. One option is to use a cleaner liquid that you brew just like coffee, but is cleaning solution. You will then run two water coffees after this to make sure all the solution is out. Vinegar and water also work to clean out the coffee maker in case you don't have the cleaning solution. If you do this regularly, your c...

How To: Increase screen contrast in Mac OS X

Mac OSX offers an easy solution to increasing the contrast of your display, and switching the screen from black on white to white on black. In the Universal Access section of System Preferences, under the large "Display" label, you will find a set of controls. Switching from black on white to white on black will invert the colors on the screen, making it easier to read for some people. There is a toggle to the right of that control which switches your display from color to grayscale. Below th...

How To: Clean a penny using vinegar and salt

In this video, Do It Your Self Central demonstrates to viewers how to clean a dirty penny by using common household products, namely vinegar and iodized salt. He suggests to put 1/2 cup vinegar and 2 teaspoons of iodized salt into a cup. This solution will be used to clean the penny. He demonstrates the power of the solution by holding the penny into the mixture for a few seconds. After only a short time, he shows the dramatic change between the portion that was dipped in the solution and the...

How To: Solve systems of linear equations by graphing

In this video the instructor shows how to solve systems of linear equation by graphing. A system of linear equation is equations of two lines that are to be graphed on the same coordinate axes. Now take the first equation and write it to form y = mx + b. Now extract the value of slope m and graph the line as shown in the video. Similarly graph the equation of the second line as shown in the video. Now if the two lines intersect at a point, that point is the solution to the system of that line...

How To: Describe a linear system without graphing

This tutorial looks at how to describe a linear system without actually graphing it. In order to do that, you will need to convert both equations of a problem into the Y=mx+b format. Once you have done this, you will be analyzing the m and b values. There are a few rules to follow. If the slopes (or m) and the Y intercepts (or b) are equal, there are an infinite number of solutions (or dependent equations). A second rule is if the slopes are equal and the Y intercepts are different, then the ...

How To: Solve a rational equation with no solution

This is a very interesting mathematical instructional video on how to find rational equation with no solution. How to solve the equation and check the answer. Let us take the example m over m-3 minus 4 is equal to 3 over m-3. In this equation we get m-4m+12 over m-3 is equal to 3 over m-3. When we simplify it further we get -3m +12 = 3. Or -3m = -9 and m = 3. This video teaches you very clearly how to solve a rational equation with no solution.

How To: Use vinegar & hydrogen peroxide to reveal fingerprints

Learn how to find latent finger prints on brass surfaces, such as fired cartridge cases. Called the Acidified Peroxide method, using only white distilled vinegar and hydrogen peroxide that you can find at your local drugstore, you can uncover fingerprints that is usually impossible to see using other methods. After mixing the vinegar and hydrogen peroxide the solution should start turning a greenish color around the brass object after 5 to 10 minutes. After you see the green color throw away ...

How To: Bake blueberry and strawberry muffins with nuts

Sunny's baking muffins with bananas, berries and walnuts. Follow along and make some delicious multifruit and nut muffins for a sweet treat. This cooking how-to video is part of cooking for Real show hosted by Sunny Anderson. With an understanding of everyday life and that real people deserve down-to-earth delicious meals; Cooking for Real offers real food, for real life. Serving up solutions for easy to prepare, fantastic tasting menus, Sunny Anderson elevates the everyday meal by taking aff...

How To: Make New Orleans French toast with Sunny Anderson

Sunny Anderson cooks up delectable New Orleans style French toast. Watch as she cooks with an understanding of everyday life and that real people deserve down-to-earth delicious meals; Cooking for Real offers real food, for real life. Serving up solutions for easy to prepare, fantastic tasting menus, Sunny Anderson elevates the everyday meal by taking affordable, easy to find, easy to use ingredients and infusing them with diverse influences and a taste for rich, rewarding flavor. Sunny's fre...